Why are igneous rocks that consist of very small crystals called aphanitic?
A) Aphanitic comes from the Greek word phaneros, meaning visible.
B) Aphanitic comes from the Greek word aphaneros, meaning invisible.
C) They form deep within the earth's crust.
D) They form deep within the earth's ocean.

Question

Quizplus · Accepted Answer

Aphanitic comes from the Greek word aphaneros, meaning invisible, which is appropriate for rocks that consist of very small crystals that are difficult or impossible to see with the naked eye.

Why Are Igneous Rocks That Consist of Very Small Crystals