Questions and Answers
What are the three main groups into which rocks are usually grouped?
Igneous rocks, sedimentary rocks, and metamorphic rocks
How are igneous rocks formed?
When magma cools in the Earth's crust, or lava cools on the ground surface or the seabed
What process forms sedimentary rocks?
Diagenesis and lithification of sediments
What was the early period of human history, characterized by the use of stone tools, called?
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What is the study of rocks called?
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