Question

A geologist looks at a piece of igneous rock under a microscope and sees tiny crystals of olivine, pyroxene, and plagioclase feldspar.
What process might have formed this rock?
A. melting underground, violent volcanic eruption, and solidification above ground
B. melting underground, flowing to Earth's surface, and solidification above ground
C. solidification underground, violent volcanic eruption of ash and solid rock
D. both melting and crystallization underground

Answer 1

Igneous rocks are formed as magma solidifies on the earth surface.

The process that might have formed this rock is:

A. melting underground, violent volcanic eruption, and solidification above ground

Igneous Rocks

Igneous rocks are known to be rocks that are formed when the magma melts underground and rises up to the earth surface via volcanic eruptions.

When they rise to the earth surface, they cool and solidify. This process will then result to the production of crystals.

Intrusive and extrusive rocks are formed in this process.

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