GEOLOGY

Detailed explanation-1: -When the magma chamber empties, the support that the magma had provided inside the chamber disappears. As a result, the sides and top of the volcano collapse inward. Calderas vary in size from one to 100 kilometers (0.62 to 62 miles) in diameter. Some calderas form a lake as the bowl-shaped depression fills with water.

Detailed explanation-2: -Introduction. Calderas form when magma chambers are partially emptied during large eruptions and the land surface subsides and the area above the shallow magma reservoir collapses.

Detailed explanation-3: -A caldera is a depression created after a volcano releases the majority of the contents of its magma chamber in an explosive eruption. Without any structural support below, the land around the erupting volcanic vent or vents collapses inwardly, creating the bowl-shaped caldera.

Detailed explanation-4: -Calderas are often associated with large eruptions (those producing volumes of 10 cubic km [2.4 cubic miles] or more) of dacitic or rhyolitic magma that form pyroclastic plateaus.