1. Some volcanoes have explosive eruptions, like the one at Mount St. Helens in 1980. Eruptions like these can cause abrupt changes to Earth's surface.

Which of these could result from an explosive volcanic eruption?
A) A flow of ash and debris rushes down the volcano's slope.
B) Part of the volcano is blasted away.
C) Volcanic ash covers the surrounding area.
D) all of these