caves
formed by dissolving underground rocks with water
solution cave
Began as limestone;beautiful and widely used.
marble
good conductor of electricity; used in brass and bronze
copper
poorest quality coal
lignite
used to make glass
sandstone
lives in or above caves.
troglophile
most common igneous rock
granite
the most commonly used practical metal
iron
most common type of coal ( soft coal)
bitumiuous
trances of plants or animals left in rock
fossils
visits caves regularly but returns to the surface for food
trogloxene
began as shale; heard with leaf-like layers
slate
rare,durable and beautiful
precious stones
thick,dark,flammable liquid;a fossil fuel
petroleum
only stone formed by living animals
reef limestone
forms at the surface; cools rapidly; fine- grained
extrusive
small deposits of igneous and metamorphic crystals
gemstones
heard ,shiny,black coal;expensive to mine
anthracite
formed by chemical sediments; used for salting roads and flavoring food
halite