The main difference between intrusive and extrusive igneous rocks is ___?

A. Intrusive is due to magma cooling deep within Earth's interior and extrusive is due to it cooling at Earth's surface.

B. Extrusive rocks form quickly and intrusive rocks form over millions of years.

C. Extrusive is due to magma cooling deep within Earth's interior and intrusive is due to it cooling at Earth's surface.

D. Intrusive rocks are made of magma and extrusive rocks are made of volcanic ash.

Question

Geography

Cullen Bishop

4 July, 19:04

The main difference between intrusive and extrusive igneous rocks is ___?

A. Intrusive is due to magma cooling deep within Earth's interior and extrusive is due to it cooling at Earth's surface.

B. Extrusive rocks form quickly and intrusive rocks form over millions of years.

C. Extrusive is due to magma cooling deep within Earth's interior and intrusive is due to it cooling at Earth's surface.

D. Intrusive rocks are made of magma and extrusive rocks are made of volcanic ash.

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Answers (1)

Know the Answer?

Madden Liu · Answer 1

The correct answer is A. Intrusive is due to magma cooling deep within Earth's surface and extrusive is due to it cooling at Earth's surface.

The intrusive rocks are forming deep bellow the surface, and they cool off very slowly. Because of that they are forming big crystals.

The extrusive rocks are forming on the surface, and they cool off very quickly. Because of that they are forming small crystals.