Q: Huge calderas form when the mountain above an empty chamber of what collapses?


Read this paragraph and choose the correct option from the provided answers:

During a massive eruption, all of the material may be ejected from a magma changer. Without support, the mountain above the empty chamber may collapse. This produces a huge caldera . Calderas are generally round, bowl-shaped formations ( Figure below ).

 Choices:

- gas

- mercury

- coal

- magma


A:
magma