Which statement is true about extrusion relative to surrounding rock?

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Study for the California Science Test. Get ready for the 8th grade exam with flashcards and multiple choice questions, each question has hints and explanations. Prepare with confidence!

Multiple Choice

Which statement is true about extrusion relative to surrounding rock?

Explanation:
Extrusion is molten rock that erupts onto the surface and then cools to form rock. The key idea is that the rocks beneath had to exist first to be covered by the lava, so the rock that forms from the extrusion is younger than the rocks below it. Erosion doesn’t create extrusive rock—it wears away material. And extrusions aren’t limited to sedimentary rocks; lava can flow onto and solidify over many kinds of existing rocks.

Extrusion is molten rock that erupts onto the surface and then cools to form rock. The key idea is that the rocks beneath had to exist first to be covered by the lava, so the rock that forms from the extrusion is younger than the rocks below it. Erosion doesn’t create extrusive rock—it wears away material. And extrusions aren’t limited to sedimentary rocks; lava can flow onto and solidify over many kinds of existing rocks.

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