Question

1. a _____ forms when an underground magma chamber collapses.

options: caldera, composite volcano, cinder cone, lava plateau

Explanation:

A caldera is a large depression formed when an underground magma chamber empties and collapses. Composite volcanoes are steep-sided cones built from alternating lava and ash, cinder cones form from small, explosive ash/cinder deposits, and lava plateaus form from widespread, fluid lava flows, none of which match the described formation process.

Answer:

A. caldera