|
One difference between wide & narrow craters is the presence of this to mix with magma & cause big steam explosions |
water
|
$800 |
DJ |
UNDER THE VOLCANO |
2007-11-13 |
#5332 |
|
An opal is silicon dioxide & this, which explains why they tend to dry out |
water
|
$1,200 |
DJ |
GEMS & JEWELS |
2003-09-17 |
#4373 |
|
One estimate says there are about 326 million cubic miles of this compound in, on & above the Earth |
water
|
$400 |
DJ |
GEOLOGY TEST |
2002-09-13 |
#4145 |
|
Abraham Gottlob Werner's Neptunism theory claimed the Earth was once covered by this; he was wrong |
water
|
$100 |
J |
GEOLOGISTS |
1996-06-24 |
#2736 |
|
An aquifer is a body of rock that contains & releases this |
water
|
$200 |
DJ |
GEOLOGY |
1992-01-22 |
#1708 |
|
Opal & turquoise are found mostly in parts of world where there is little of this |
water (rainfall, moisture)
|
$400 |
J |
GEMS |
1986-04-29 |
#427 |