Geology Crossword 1

a type of rock made from solid material left by the action of water, ice, or wind
a type of rock changed to a new form as a result of physical processes, such as pressure or heat
a very hard type of coal that burns slowly and produces a lot of heat with very little smoke and a small flame
A low-grade, brownish-black coal
A mid-grade coal once used in factories all over the world
The period on earth when the first reptiles appeared and there were large forests covering the areas that later formed earth's coal layers
A type of sedimentary rock formed by sand
a rock that consists of small, rounded stones that are held together by clay and sand
part of a plant or animal, or its shape, that has been preserved in rock or earth for a very long period
to cause a liquid to change to a gas, especially by heating
a gray rock formed from the shells of sea animals
a soft, white, porous, sedimentary rock