Geology Study Guide

Science 1,086 clues | 166 recurring answers

Topic Overview Study Guide Practice

166

answers to learn

23 Must-Know

41 Should-Know

102 Worth Knowing

Quick Reference: Must-Know Answers

These appear 8+ times. Memorize these first.

the pearl 18 turquoise 17 a diamond 17 Jade 15 the topaz 15 pearls 14 sedimentary 13 marble 13 a ruby 13 quartz 12 Amethyst 12 an emerald 12 the opal 11 diamonds 10 a garnet 10 a sapphire 10 rubies 9 lapis lazuli 9 graphite 9 coal 9 emeralds 8 asbestos 8 amber 8

Answers by Category

Chemistry / Elements

77 answers | 361 clues

Must-Know (12)

the pearl 18x 5.6% stumper $339 avg J:10 DJ:8

DJ $200 1995 The waters of the Persian Gulf are an important source of this gem

DJ $800 1990 This 1948 film based on a Steinbeck story about a fisherman was shot in Mexico

J $200 2018 The orient is the term for the surface iridescence of this mollusk product

a diamond 17x 5.9% stumper $388 avg J:12 DJ:5

J $100 2001 This dazzling rock is so hard it can only be scratched by another one

J $600 2014 The regent, one of these gems, was once called the pitt, for Thomas Pitt who purchased it in 1702

DJ $1,200 2012 In an Arkansas state park, you can dig for this state gem of Arkansas

pearls 14x 7.1% stumper $471 avg J:6 DJ:8

J $100 1992 Renaissance women wore several necklaces at a time, often made of these mollusk gems

DJ $800 2003 Miss Manners says it is almost always proper to wear a strand of these, but never with your bathing suit

DJ $1,000 1988 In Japan Lake Biwa is the main source of these gems

sedimentary 13x 23.1% stumper $542 avg J:6 DJ:7

DJ $200 1994 Of the 3 major types of rock, nearly all oil deposits occur in this one

J $500 1987 Though ¾ of earth's surface is covered with this type rock, below there are only metamorphic & igneous rocks

DJ $1,200 2022 Cementation is the last stage in the formation of this type of rock made from accumulated deposits

a ruby 13x 15.4% stumper $400 avg J:10 DJ:3

J $100 1997 Examples of this July birthstone found in Sri Lanka are typically a pale shade of red

J $600 2007 (Sarah of the Clue Crew shows a gem.) This term is used for red varieties of the gemcorundum

DJ $1,200 2008 Chrome & iron are what give this, red corundum, its color

diamonds 10x 20.0% stumper $320 avg J:5 DJ:5

DJ $200 2000 Talc is at one end of the Mohs scale of hardness & this is at the other

J $500 DD 1996 Deposits near the mouth of the Orange River have been a rich source of these precious gemstones

J $200 1997 Like South Africa's, Namibia's economy is based in part on exports of gem-quality ones of these

rubies 9x 12.5% stumper $425 avg J:5 DJ:3 FJ:1

J $200 1996 This highly prized form of corundum gets its red color from minute amounts of chromium

J $600 2008 The Bible tells us "The price of wisdom is above" these gems, July's birthstone

FJ 1984 Carat for carat, these corundum gems are the most expensive in the world

graphite 9x 12.5% stumper $1,075 avg J:3 DJ:5 FJ:1

J $400 2023 When combined with clay, this mineral seenhereis what makes up the lead in your pencils

DJ $600 1993 This soft black mineral, a form of carbon, is the primary raw material for synthetic diamonds

DJ $4,200 DD 2003 German geologist Abraham Werner gave this mineral its name, derived from a Greek word for "to write"

coal 9x 22.2% stumper $500 avg J:5 DJ:4

J $100 1996 Pressure converts this fuel into graphite

DJ $600 1993 Heating it in an airtight oven turns this into coke

DJ $200 1996 Heating values of the bituminous type of this range from about 5,600 to 8,000 calories per gram

emeralds 8x 12.5% stumper $588 avg J:4 DJ:4

J $100 1996 In the 1930s Carroll F. Chatham invented a process to create these green gems artificially

DJ $1,200 2002 The choicest specimens of these green gems are extracted from the mines at Muzo, Colombia

J $200 2008 The choicest specimens of these green gems are extracted from the mines at Muzo, Colombia

asbestos 8x 62.5% stumper $675 avg J:3 DJ:5

J $400 2018 Fireproof but unhealthy: OBSESS AT

J $600 2003 Quebec produces much of the world's supply of this heat-resistant mineral now banned in most U.S. products

DJ $1,200 2017 Chrysotile, the fibrous form of serpentine, provides around 95% of this heat-resistant material in commercial use

amber 8x $675 avg J:2 DJ:6

J $200 1994 Beads & pendants made of this fossilized resin may contain the remains of ancient insects

DJ $600 1994 Prehistoric DNA has actually been extracted from creatures fossilized in this

DJ $1,600 2021 This fossilized resin has one of the lowest densities among gems & it will often float in salt water

Should-Know (23)

Vesuvius 7x $614 avg J:4 DJ:3

J $200 2011 About its eruption in 79 A.D., an observer wrote that "broad sheets of fire and leaping flames blazed at several points"

J $500 1991 The Book of Knowledge says the oldest volcanic observatory is at this volcano that killed Pliny

DJ $1,600 2010 Formed in lava, leucite is common on the slopes of this mount above the Bay of Naples

pumice 7x 42.9% stumper $943 avg J:2 DJ:5

J $600 2023 This lightweight, porous volcanic rock is used in concrete & plaster as well as in abrasives & scouring compounds

DJ $1,000 1992 To polish teeth, dentists use a powder made from this light-colored volcanic rock

DJ $600 1993 Pedicurists know a "stone" composed of this abrasive igneous rock helps keep the feet neat

green 7x $286 avg J:4 DJ:3

J $100 1993 Uralian emerald is a type of garnet that's this color, not red

J $500 1991 Malachite, which is used as an ornamental stone, is this color

J $200 DD 2001 A carbonate of copper, the ornamental stone malachite is this color

earthquakes 7x 28.6% stumper $443 avg J:1 DJ:6

DJ $200 1991 The elastic-rebound theory is one guess at the cause of these

DJ $600 1992 The Modified Mercalli index is used to rank their intensities

DJ $1,000 1988 The 3 main types of waves these produce are classified as P, S & L

a glacier 7x 14.3% stumper $814 avg J:2 DJ:5

DJ $200 1992 Erosion by one of these moving masses often produces a U-shaped valley

DJ $800 2025 Made up of material ranging from boulders to sand, a moraine is debris carried & deposited by one of these masses over time

DJ $1,600 2008 Alaska's Malaspina is an example of the piedmont type of this, where ice spreads out over a large terrain

gold 7x $500 avg J:4 DJ:3

J $300 1988 Pyrite contains both sulfur & iron but only a "fool" thinks it contains this

DJ $600 1995 Common name of the sulfide mineral FeS2; it looks more valuable than it is

J $500 1991 Iron pyrite is sometimes called this from its resemblance to a precious metal

Antarctica 6x $383 avg J:5 DJ:1

J $200 1996 In 1957 Sir Vivian Fuchs led the first crossing of this continent; it took 99 days

J $500 1997 Mount Erebus in this continent's Victoria Land region was discovered by Sir James Ross in 1841

DJ $200 1993 A new plate tectonics theory says that North America was connected to this cold continent for a billion yrs.

opals 6x $667 avg J:3 DJ:3

J $300 1996 The "blazing" name of these opals is misleading; many do not give off brilliant flashes of color

J $500 1996 These October birthstones may lose their color & crack if allowed to dry out

DJ $1,000 1991 The belief that these gems are unlucky may derive from a Sir Walter Scott novel, "Anne of Geierstein"

iron 6x $480 avg J:1 DJ:4 FJ:1

DJ $400 1993 Too little of this trace mineral & you become anemic

DJ $800 1986 The mineral hematite is the chief source for this metallic element

FJ 1999 The Centers for Disease Control & Prevention says it's the nutrient Americans are most likely to be deficient in

shale 5x 20.0% stumper $960 avg DJ:5

DJ $400 1990 The largest known reserves of this oil-producing rock are found in the Piceance Creek Basin in Colorado

DJ $600 1994 The most abundant sedimentary rock is this layered variety made of silt & clay

DJ $1,000 1990 Slate is formed by the action of heat & pressure upon this sedimentary rock

Mount St. Helens 5x $300 avg J:3 DJ:2

J $100 1991 The ash from its 1980 eruption was so rich in silica, commemorative glass ashtrays were made of it

DJ $200 1994 In 1980 the largest of the blasts from this Washington volcano could be heard 135 miles away

J $400 2017 Soon after this volcano erupted in 1980, the city of Spokane was plunged into darkness due to the ash

limestone 5x 20.0% stumper $1,060 avg J:1 DJ:4

J $500 1994 The rock of Gibraltar is this type of rock made up of calcite, a form of calcium carbonate

DJ $1,000 1992 Sinkholes & tunnels honeycomb this type of sedimentary rock in karst on the Adriatic

DJ $1,000 1987 Chalk is a form of this sedimentary rock

Iceland 5x 20.0% stumper $860 avg J:3 DJ:2

J $200 2010 In 2010 stranded airline passengers learned that Eyjafjallajokull is a volcano in this country

J $600 2002 A 1963 underwater eruption began the formation of the island of Surtsey off this north Atlantic country

DJ $1,200 2025 Scientists think centuries-old ash at the bottom of the North Atlantic came from Katla, one of this country's myriad volcanoes

caves 5x 20.0% stumper $1,140 avg J:2 DJ:3

DJ $200 1993 Stalactites & stalagmites are 2 types of dripstones that are commonly found in these places

J $1,500 DD 2020 J. Harlen Bretz explored many of these with his dog; in his book, these "of Missouri", he called them "valleys with roofs"

J $400 1991 Speleothems are oddly-shaped rock formations found in these

anthracite 5x $720 avg J:2 DJ:3

J $200 2023 You get an "A" if you know this is the highest-ranking & cleanest-burning coal available

DJ $600 1992 Jet black & somewhat lustrous, it's the highest rank, or class, of coal

DJ $1,600 2017 Containing more carbon than other types, this highest ranking coal has a metallic-like luster

water 5x $460 avg J:2 DJ:3

J $400 1986 Opal & turquoise are found mostly in parts of world where there is little of this

DJ $1,200 2003 An opal is silicon dioxide & this, which explains why they tend to dry out

J $100 1996 Abraham Gottlob Werner's Neptunism theory claimed the Earth was once covered by this; he was wrong

weathering 4x 75.0% stumper $1,050 avg J:1 DJ:3

DJ $600 1988 Term given to the erosion of rocks from exposure & variations in humidity & temperature

J $1,000 2020 If water or wind alters rock, it's called by this meteorological name; if that process moves the rock, that's erosion

DJ $1,000 1992 Part of the erosion process, it's the breakdown of rocks by wind, rain & temperature

the continental shelf 4x 25.0% stumper $950 avg J:2 DJ:2

J $400 1995 Running along the coastline of North America & other land masses, it's covered by up to 600' of seawater

J $800 2016 (Kelly of the Clue Crew shows a geological diagram on the monitor.) Oceanic islands like Hawaii rise to the surface from the ocean floor; continental islands, like New Guinea, are simply unsubmerged parts of these shallow terraces at the edge of a co...

DJ $1,000 1985 It's the submerged land surrounding the continents

faults 4x 25.0% stumper $525 avg J:2 DJ:2

J $100 1994 The San Andreas is an example of the strike- slip type of these geologic features

J $800 2020 These features have their disastrous downsides, but on the plus side many, such as Australia's Junction one, host gold deposits

DJ $400 2015 A rift valley is an elongated trough formed between dip-slip types of these fractures

pyrite 4x 25.0% stumper $600 avg J:1 DJ:3

DJ $400 2003 The sulfur from this mineral, also known as fool's gold, is used to make sulfuric acid

J $800 2018 No foolin': TRY PIE

DJ $400 1990 This fool's gold can be told from gold when heated because it emits a foul odor

gypsum 4x 50.0% stumper $800 avg DJ:4

DJ $400 2010 Drywall is also called gypboard, the "gyp" short for this

DJ $800 2000 The white sands of New Mexico's White Sands National Monument are this plaster material

DJ $1,000 1992 The dunes at White Sands Nat'l Monument in New Mexico are composed of this, hydrated calcium sulfate

a stalactite 4x 25.0% stumper $700 avg J:3 DJ:1

J $200 1996 Term for an icicle-shaped mass hanging from a cave roof

DJ $800 2011 The sword of Damocles is a large one of these formations in Carlsbad Caverns

J $1,600 DD 2024 An attraction at Carlsbad Caverns is one of these long formations known as the Sword of Damocles

salt 4x 25.0% stumper $650 avg DJ:4

DJ $400 2003 Over half the use of this mineral in the U.S. is for spreading on roads & highways to melt ice & snow

DJ $600 1989 Doctors advise a restricted intake of this to help reduce blood pressure

DJ $1,200 2023 Seen here, deposits at Badwater Basin of what is mostly this mineral leave polygon-shaped designs due to water evaporation

Worth Knowing (42)

zircon 3 Queen Elizabeth II 3 Pangaea 3 niacin 3 New Zealand 3 muscovite 3 lead 3 Hawaii 3 garnets 3 erosion 3 coral 3 cleavage 3 chalk 3 Australia 3 Alexandrite 3 a caldera 3 the core 3 a geode 3 wind 2 strata 2 stalagmites 2 Spain 2 South Dakota 2 silicon & aluminum 2 serpentine 2 Pliny 2 Pinatubo 2 oxygen 2 ore 2 Mt. St. Helens 2 Mt. Pinatubo 2 Mexico City 2 Martinique 2 loam 2 Kilauea 2 earrings 2 copper 2 Colombia 2 a magnet 2 a crater 2 (James) Smithson 2 stainless steel 2

Earth Science

38 answers | 137 clues

Must-Know (3)

Jade 15x 6.7% stumper $673 avg J:7 DJ:8

DJ $200 1989 Chinese carvings of this stone from the Ching period are especially treasured by collectors

J $500 1997 Chinese scholar Hsu Shen attributed human virtues to this gem

J $1,000 2017 The raja delved into the history of the carved figure & found it was made of this prized gemstone

marble 13x 7.7% stumper $477 avg J:6 DJ:7

J $100 1994 Much of this stone used by Michelangelo for his sculptures came from Carrara, Italy

J $500 DD 1990 The Carrera type of this is from Italy, Pentelic from Greece & Yule from Colorado

DJ $1,200 2022 Botticino & Calacatta are Italian varieties of this metamorphic rock

quartz 12x 25.0% stumper $742 avg J:2 DJ:10

J $300 1992 Of quartz, calcite, or mica, the one which has no cleavage

J $600 2025 When clear & colorless, this common mineral is known as rock crystal

DJ $1,000 1995 Agate, jasper & bloodstone are all forms of this silica mineral

Should-Know (8)

aquamarine 7x 14.3% stumper $1,271 avg J:3 DJ:4

DJ $400 2012 Colorado's official state gem is this "watery" greeny-blue one

J $500 1993 A 243-pound crystal of this "sea-colored" gem was discovered in Brazil in 1910

DJ $5,000 DD 2015 This blue-green variety of beryl is routinely heated to make it bluer by removing the yellow color

magma 5x 20.0% stumper $680 avg J:2 DJ:3

J $200 2023 Before it reaches the surface & goes blooey, lava is known as this

DJ $800 2006 A cauldron subsidence is when a mass of solid rock sinks into a pool of this subterranean molten rock

DJ $1,600 2012 Chromite, from which we get chromium, is formed when this cools & solidifies underground

granite 5x 20.0% stumper $760 avg J:1 DJ:4

DJ $200 1993 The most extensively occurring igneous rock, a lot of things are "taken for" it

DJ $600 1996 The name of this hard igneous rock comes from Latin for "grain"

DJ $2,000 2004 The Pilgrim Monument in Provincetown is the tallest structure in the U.S. made entirely of this

a volcano 5x $680 avg DJ:5

DJ $200 1993 In 1963 the island of Surtsey near Iceland was created by one of these

DJ $600 1988 A caldera is formed by the collapse of the cone on one of these

DJ $2,000 2003 The Eniwetok Atoll sits on a limestone cap that's sitting on the summit of one of these

talc 4x 50.0% stumper $800 avg J:2 DJ:2

J $200 2025 Used in a dusting powder, this 4-letter mineral is a 1, meaning the softest, on the Mohs hardness scale

DJ $800 1988 In January 1978 "Baby Come Back" was No. 1 on the pop charts & this mineral was no. 1 on the Mohs scale

J $1,000 2007 On the Mohs scale, this mineral can be scratched by every other mineral

Scotland 4x 25.0% stumper $700 avg DJ:4

DJ $600 1999 You can find caledonite in this country that lent its ancient name to the mineral

DJ $600 1993 Popularly worn in brooches, cairngorm is a smoky quartz from this country

DJ $800 1995 Cairngorm, a brown quartz stone, is named for a mountain in this country

red 4x $1,400 avg J:2 DJ:2

J $200 2007 For its state mineral, Colorado chose rhodochrosite, which is a deep shade of this primary color

J $5,000 DD 2002 When scratched against a surface, hematite leaves this color streak

DJ $200 1999 Old masters could grind up hematite or cinnabar to make shades of this primary color

lava 4x 25.0% stumper $325 avg J:2 DJ:2

DJ $200 1985 When it flows above the ground, magma is called this

J $300 1987 This highly fluid substance hardens into pahoehoe & aa

J $400 2007 Scoria, a dark, glassy rock created from this, is heavier than pumice & has bigger holes

Worth Knowing (27)

obsidian 3 basalt 3 the ocean 3 petrified wood 3 an earthquake 3 Vulcan 2 titanium 2 the Richter scale 2 the Himalayas 2 soapstone 2 Rock of Gibraltar 2 mica 2 Mexico 2 metamorphic 2 meerschaum 2 Mauna Loa 2 igneous 2 Hawaiian 2 hardness 2 Etna 2 an aftershock 2 Alaska 2 a crevasse 2 George Washington 2 plate tectonics 2 Frederich Mohs 2 Crater Lake 2

Biology / Animals

19 answers | 105 clues

Must-Know (4)

turquoise 17x 5.9% stumper $800 avg J:4 DJ:13

J $200 2018 Howlite dyed blue to imitate this ancient stone is sold as turquenite

J $500 1987 The French called it the "Turkish stone", but the finest comes from Nishapur, Iran

DJ $1,400 DD 2011 The Aztecs prized this blue-green gemstone & a double-headed serpent mosaic of it is an icon of their art

Amethyst 12x 16.7% stumper $675 avg J:4 DJ:8

DJ $200 1991 Often found in geodes, this purplish gem is the most highly valued quartz stone

DJ $800 2012 South Carolina is in the purple with this purple quartz as its gemstone

J $1,000 2018 Iggy Azalea's real first name is this, a purple gemstone

an emerald 12x $383 avg J:8 DJ:4

J $100 1992 This green gemstone, a form of the mineral beryl, gets its color from minute amounts of chromium

DJ $800 2024 In Colombia, the color of this gem varies depending on the mine: yellowish green from the Muzo mine, bluish green from the Chivor mine

J $1,000 DD 2010 L. Frank Baum had this birthstone, the same as the name of a city he created

the opal 11x 45.5% stumper $1,191 avg J:6 DJ:5

J $200 1994 This gemstone that comes in fire & black varieties is a variety of the mineral Cristobalite

J $500 1986 The Lightning Ridge deposit in Australia has largest source of this iridescent "black" stone

J $1,000 2007 (Cheryl of the Clue Crews shows off her stone.)It'sone of the only natural gemstones to show play of color, the flashing of different colors within the same stone

Should-Know (6)

slate 6x $667 avg J:3 DJ:3

DJ $200 1986 Intense pressure on shale turns it into this "blackboard" material

J $800 2014 A shade of gray is named for this rock originally used in blackboards

J $1,000 2018 In the late 1800s this material that naturally splits into thin sheets was very popular for roofs in the northeast

emery 6x $500 avg J:2 DJ:4

DJ $200 1992 When powdered, this mineral is glued onto cardboard & used in manicuring

J $600 2018 Peekskill, N.Y. was once a center for mining this abrasive rock used on a "board" to file nails

J $1,000 2002 You may be "board" to know that this natural abrasive is second only to diamonds in hardness

the mantle 6x 16.7% stumper $733 avg J:1 DJ:5

DJ $400 2024 This layer of the Earth makes up more than 80% of its volume

DJ $600 1993 Mafic magma is thought to originate in this solid layer beneath the earth's crust

J $1,000 2007 According to plate tectonics theory, there are many plates, each consisting of the crust & the upper part of this

South Africa 5x 20.0% stumper $540 avg J:3 DJ:2

J $200 1997 The best tiger's-eye comes from Griqualand West in this country also known for its diamonds

J $800 2007 The 3,106-carat Cullinan Diamond, the largest ever discovered, was unearthed in what's now this country in 1905

DJ $1,000 1989 Kimberlite, a mineral in which diamonds are found, was named for a city in this country

agate 5x 20.0% stumper $580 avg J:1 DJ:4

DJ $200 1997 Marbles made of this mineral are popularly called aggies

DJ $600 1995 A kids' marble is made from this mineral with colors in stripes or clouds

DJ $1,200 2013 One of May's birthstones, it's named for Sicily's Achates River, where it was mined in antiquity

glaciers 4x $550 avg J:2 DJ:2

J $200 1988 The movement of these rivers of ice carved the fjords

DJ $600 1985 Created by perpetual snow, they move when weight on top causes bottom to turn plastic & flow

DJ $600 1985 The largest are called ice sheets, found in Greenland & the Antarctic

Worth Knowing (9)

the magnetic North Pole 3 Alabaster 3 cat's eye 3 the Pleistocene 2 the lithosphere 2 sardonyx 2 mammals 2 luster 2 jet 2

Astronomy / Space

16 answers | 80 clues

Must-Know (4)

the topaz 15x 40.0% stumper $800 avg J:9 DJ:6

J $300 1994 1 of the 2 items on the Mohs hardness scale whose name ends in "z"

J $500 1996 The National Museum of Natural History has a 22,892.5-carat one of these golden gems

DJ $1,200 2015 The astronomer carefully adjusted the top azimuth of his telescope made of this

a garnet 10x 30.0% stumper $760 avg J:4 DJ:6

DJ $400 1985 Gemstone which got its name from resembling the red seed of the pomegranate

DJ $600 1994 An Arizona ruby isn't a real ruby, it's a ruby-colored one of these January birthstones

J $1,000 2025 Almandineis a type of this gemstone that's been favored by lapidaries since ancient times & lends its name to a very dark red

a sapphire 10x 10.0% stumper $830 avg J:2 DJ:8

DJ $400 2015 Jones says his app hires drivers; we can pay them with this blue gem

DJ $800 1993 The most highly prized color of this September gem is cornflower blue

DJ $1,000 1996 The name of this gem may come from the Sanskrit sanipriya, meaning "dear to the planet Saturn"

lapis lazuli 9x 22.2% stumper $1,300 avg J:2 DJ:7

J $500 1993 The old masters created the pigment ultramarine by crushing this 2-word blue gemstone

DJ $1,000 1992 The name of this bluish gem used in jewelry & for carvings means "stone of azure"

J $800 2008 This 2-word gemstone was once ground to produce ultramarine, a deep blue paint pigment

Should-Know (3)

flint 6x $900 avg J:1 DJ:5

DJ $200 1992 Early man produced sparks to start fires by striking this mineral against iron

DJ $4,000 DD 2011 This form of silica, also the name of a Michigan city, is Ohio's gemstone

DJ $200 1985 Striking this hard form of quartz with steel produces a spark

Africa 5x 20.0% stumper $1,260 avg J:2 DJ:3

J $500 1989 Most of the world's supply of diamonds comes from this continent

DJ $1,000 1989 The diamond known as the "Star of" this continent is set in the British royal scepter

J $600 2006 The only known source of a gemstone called tanzanite was discovered in 1967 on this continent

Blue 4x $250 avg J:2 DJ:2

J $200 1996 The most prized turquoise is this bird-related shade

DJ $200 1996 Sapphires come in many colors, but the finest ones are this color

DJ $200 1993 Azurite got its name because it is the azure shade of this color

Worth Knowing (9)

the Moon 3 mercury 3 Krakatoa 3 vitamin D 2 star 2 Mount Fuji 2 India 2 Brazil 2 the Crown Jewels 2

Other

11 answers | 26 clues

Should-Know (1)

Michigan 4x 25.0% stumper $850 avg J:2 DJ:2

J $800 2014 Isle Royale Greenstone is found chiefly as smallpebbleson the beaches of this state

DJ $1,000 1990 Isle Royale greenstone, this state's official gem, is found on the largest island in Lake Superior

J $800 2008 Isle Royale greenstone, this state's official gem, is found on Isle Royale in Lake Superior

Worth Knowing (10)

the Hope Diamond 3 plaster of Paris 3 the Mesozoic 2 the Andes 2 Tanzania 2 San Andreas Fault 2 rivers 2 onyx 2 Gondwanaland 2 France 2

Medicine / Health

3 answers | 8 clues

Worth Knowing (3)

J.P. Morgan 3 the bloodstone 3 the kidneys 2

Math / Physics

2 answers | 4 clues

Worth Knowing (2)

Tiffany 2 Cartier 2

Start Studying Geology
« Back to Geology overview