how is a caldera different from a crater
Caldera. A large depression made because of volcanic activity is called a caldera. It is the result of a large cavity created underground when a chamber of magma and lava gets emptied. This cavity creates pressure and the over ground rocks collapse to create a large depression.This large depression is called a caldera.rater. A volcanic crater is a bowl like structure at the top of a volcano around the opening that is used for eruption of magma and lava. This is a depression that is the result of sinking in of the rocks because of high pressure. Mostly it has the opening through which lava and ash flows upwards.