Caldera
A mass rock is formed when a volcano's magma chamber empties and the overlying rock collapses into the empty chamber. This creates a steep-walled depression or caldera at the volcano's summit. It is a common feature of collapsed volcanoes.
Its called a "caldera".
caldera
No. They are simply called pyroclastic flows. A caldera is a depression formed in the ground when a volcano, usually a composite volcano, collapses as the magma chamber partially empties during an especially violent eruption.
The large circular depression at the top of a volcano that forms when the roof of the magma chamber collapses is called a caldera. Calderas can be huge in size and are formed during explosive volcanic eruptions or when the magma chamber empties and the summit collapses into the void left behind.
When a volcano collapses into itself at its top, it forms a large crater called a caldera. Calderas are formed when the magma chamber of a volcano empties during an eruption, causing the summit to collapse inward.
A crater that becomes very large as a result of the collapse of its walls is called a caldera. Calderas are typically formed after a volcanic eruption when the magma chamber empties and the summit collapses into the void below.
what happens is that it forms a caldera
caldera
Most volcanoes, when they finish erupting, leave a crater behind when the magma retreats down the volcanic pipe. Occasionally this will fill with water to leave a lake.A large surface explosion will leave behind a Caldera - a broad area possibly still of geothermal activity. Such as Yellowstone, or Okataina.
caldera
Calderas form during massive explosve volcanic eruptions. In such eruptions so much material is expelled that it leaves a large empty space under the volcano. The volcano then collapses into this space, forming a giant crater.