Answer:
B. massive volcano eruptions occurred frequently 80 million years ago
Answer:
∠I ≅ ∠K
This is the answer i have concluded from looking at others, not 100%
A caldera is a large depression formed when a volcano erupts and collapses. During a volcanic eruption, magma present in the magma chamber underneath the volcano is expelled, often forcefully. When the magma chamber empties, the support that the magma had provided inside the chamber disappears.
A magma that is rich in Silica is the kind of magma that is rich in Silica.