A geologist concludes that a rock sample is an extrusive igneous rock. Based on this information, which statement about the rock is accurate?
A. The rock likely came from a pluton.
B. The rock cooled slowly over millions of years.
C. The rock formed within Earth's crust.
D. The rock formed from cooling lava.
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Answer:
c. The rock from within earth crust
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The rock formed from cooling lava is the accurate statement.
This type of rock is formed when magma reaches the surface of the earth and cools quickly and they form a small crystal like structure for example rhyolite. It is a volcanic rock that solidifies quickly to form tiny crystals. Inside of the earth is hot that can capable of melting rocks and this melted rock is called magma which can cool to form igneous rock. This igneous rock can be extrusive or intrusive.
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