ROCKS
The hardest material produced by the earth
ROCK
The hardest known material
Diamond
This Is produced by currents of electricity that circulate in the earths outer core.
Magnet field
designed to live either in a cave or above a cave
Troglophile
Any rock containing a metal with impurities
ORE
The rarest most durable and beautiful gemstones
Precious stones
Formed at the earths surface cools rapidly and gas a fine grained appearance
Extrusive igneous rock
Visits a cave regularly but must return to the surface for food
Trogloxene
When molten rock solidifies, it forms this type of rock
Igneous
This rock is made up of Sand and mineral fragments that have been pressed together, covers over 75 percent of earth.
Sedimentary
The earth remains ___________ because of the increasing electric currents deep within its core.
Magnetized
A lava cave formed by the dissolving of underground rocks by water
Solution cave
Rock that has been changed by extreme heat or pressure into a new kind of rock
Metamorphic
A type of Metamorphic rock considered very beautiful and is most widely used- begins as limestone
Marble
The ends of a magnet are called
Poles
Caves usually formed from this material
Limestone
A type of igneous rock that remains in a pocket below the surface and cools slowly and has a coarse grain appearance
Intrusive igneous rock
Sedimentary rock formed by living mammals
Reef limestone
The magnetic field produced by the earth
Magnetosphere
The study of caves
Speleology