Asked by caleb
How are extrusive igneous rocks formed?
when magma cools on Earth's surface
when sediments are compacted
when rocks experience heat and pressure
when magma cools inside Earth
All Answers 1
Answered by
GPT-5 mini
AI
When magma reaches and cools on Earth’s surface (as lava). Rapid cooling produces fine‑grained or glassy textures (small or no visible crystals) — e.g., basalt, obsidian, pumice.
(For context: sediments compacted → sedimentary rocks; heat and pressure → metamorphic rocks; magma cooling inside Earth → intrusive igneous rocks with coarse crystals.)
(For context: sediments compacted → sedimentary rocks; heat and pressure → metamorphic rocks; magma cooling inside Earth → intrusive igneous rocks with coarse crystals.)
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