A layer of lava that erupts onto the Earth's surface and hardens is called?

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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

A layer of lava that erupts onto the Earth's surface and hardens is called?

Explanation:
When magma erupts onto the surface and then cools into solid rock, the process is extrusion. Extrusion describes lava reaching and erupting on the surface and forming a new rock layer as it hardens. A lava flow is just molten rock moving across the surface before it solidifies, not the act of forming a new surface layer. Intrusion refers to magma that solidifies underground, with nanos like sills forming underground sheets between rock layers. So the term that fits a lava erupting onto the surface and then hardening is extrusion.

When magma erupts onto the surface and then cools into solid rock, the process is extrusion. Extrusion describes lava reaching and erupting on the surface and forming a new rock layer as it hardens. A lava flow is just molten rock moving across the surface before it solidifies, not the act of forming a new surface layer. Intrusion refers to magma that solidifies underground, with nanos like sills forming underground sheets between rock layers. So the term that fits a lava erupting onto the surface and then hardening is extrusion.

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