Final answer:
A caldera is a large depression that forms at the summit of a volcano after a massive eruption or series of eruptions.
Step-by-step explanation:
The depression at the summit of a volcano is called a caldera. A caldera is a large, basin-shaped depression that forms when a volcano collapses after a massive eruption or series of eruptions. It is typically much larger and wider than a crater, which is a smaller, bowl-shaped depression caused by volcanic activity.
An example of a caldera is the famous Crater Lake in Oregon, USA. It was formed around 7,700 years ago when the Mount Mazama volcano collapsed and created a deep, water-filled caldera.
Calderas are often associated with explosive volcanoes and can have unique features like hot springs, geysers, and even small volcanic cones within.
Learn more about volcanoes