U.S. Geological Survey (USGS) Rock Practice Questions
The free U.S. Geological Survey (USGS) questions that deal with rock, with answers and explanations. The full bank and the timed practice test cover every topic the exam asks about.
Question #3
What type of rock is formed from cooled magma?
Correct answer: C
Explanation
Igneous rocks are formed from the cooling and solidification of magma or lava.
Question #9
Which rock type is formed under high heat and pressure?
Correct answer: A
Explanation
Metamorphic rocks are formed from existing rocks under heat and pressure.
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