Final answer:
When a larger volcano collapses in on itself, it forms a caldera, which is a large, basin-shaped depression. The Yellowstone Caldera in Wyoming, USA, is an example of a caldera.
Step-by-step explanation:
When a larger volcano collapses in on itself, it forms a caldera. A caldera is a large, basin-shaped depression that can be several kilometers in diameter. It is formed when the magma chamber beneath a volcano is emptied during a volcanic eruption, causing the volcano to collapse inward. An example of a caldera is the Yellowstone Caldera in Wyoming, USA, which was formed by the collapse of a much larger volcano thousands of years ago.