选项
A.
A.In time, this melted part rises as a magma.
B.
B.The formation of a volcanic eruption is a dramatic series of events.
C.
C.As the plate sinks, friction and the earth's heat cause part of it to melt.
D.
D.The magma produces heat, steam, and pressure.
E.
E.First of all, most volcanoes are formed where two plates collide.
F.
F.Then one of the plates is forced under the other and sinks.
正确答案：B