Volcanic Activity and Caldera Formation

What causes the gases in magma to expand rapidly as it approaches the surface?

• Increased temperature

• Higher density

• Decreased pressure

• Presence of water

What is the term for the large circular depression formed after a volcanic eruption?

• Caldera

• Basin

• Crater

• Rift

Which feature is commonly associated with calderas?

• Steep slopes and flat bases

• Mountain peaks

• Lava flows

• Volcanic cones