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 2
Why is the texture of the igneous rock obsidian glassy?
A) Obsidian commonly forms at the surface of lava flows.
B) Obsidian always forms beneath the earth's surface.
C) Obsidian is aphanitic.
D) Obsidian is phaneric.
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