Caldera is a feature associated with

Answer: (a) Volcanoes

A caldera is a large crater formed when a volcano collapses after an eruption.

The idea

A volcanic depression can form when the ground above a magma reservoir loses support. Collapse can leave a broad basin, much larger than the ordinary opening of a vent. The shape is linked to the volcano’s underground plumbing.

Magma accumulates below a volcano → A major eruption removes much magma → Support beneath the roof decreases → Ring-shaped fractures develop → Roof subsides → A broad caldera remains

Also know

A crater is generally a smaller depression around a volcanic vent; a caldera is a much larger volcanic depression, often formed by collapse. Yellowstone and Santorini are well-known caldera systems. A maar is an explosion crater commonly produced when magma meets water. These features need not have the same formation process.