Volcanoes are a feared and destructive force for good reason. A volcano is like a pressure valve for the inner earth, but they can also be very beautiful. One part of the volcano that people rarely see is the magma chamber. The magma chamber is way beneath the Earth's bed rock. It is tremendously hot. Running from the magma chamber to the crater of the volcano is the conduit. The conduit connects the magma chamber to the outer world. At the top of the volcano is the the crater. This is where the magma exits. Volcanoes are a beautiful yet dangerou natural phenomenon. Which type of structures on the last example can represent?

A. Chronological.

B. Cause and Effect.

C. Compare and Contrast.

D. Problem and Solution.

E. Sequence / Process.

F. Spartial / Descriptive​​​​