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Rocks and Minerals

ANSWER KEY

     By Cassie Davis
Across
Composed mostly of the mineral calcite, it usually is white, but impurities will cause streaking
One of the main fossil fuels used to generate electricity
Rocks made of layers of small bits of plant, animal, or mineral material
The shape a mineral takes in a rock when the rock forms
A scientist who studies rocks
Down
Oldest rocks on earth
Rocks that have been changed through heating and squeezing
A natural solid inorganic material with a specific chemical makeup
A natural solid mineral made of one or more minerals
I am the hardest mineral