Question

multiple choice question
heat flow through earths layers causes convection currents in the mantle. sometimes magma rises up toward the crust and breaks through to the surface. what type of geologic event occurs when this happens?
options: volcanic eruption, folded rock layers, subduction, earthquake

Explanation:

To solve this, we analyze each option:

• "volcanic eruption": Occurs when magma rises through the crust to the surface, matching the description.
• "folded rock layers": Result from tectonic forces deforming rocks, not magma reaching the surface.
• "subduction": Involves one tectonic plate sliding under another, not magma breaking through.
• "earthquake": Caused by sudden movement of tectonic plates, not magma rising to the surface.

Answer:

A. volcanic eruption