Answer:

1. Ground shaking from earthquakes can cause buildings and bridges to collapse; disrupt gas, electricity, and telephone services; and sometimes trigger landslides, avalanches, flash floods, fires, and tsunami.

2. Volcano

3. Some volcanic eruptions are explosive and others are not. The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny, gases can escape easily from it. When this type of magma erupts, it flows out of the volcano. If magma is thick and sticky, gases cannot escape easily. Pressure builds up until the gases escape violently and explode.

Explosive volcanic eruptions can be dangerous and deadly. They can blast out clouds of hot tephra from the side or top of a volcano. These fiery clouds race down mountainsides destroying almost everything in their path. Ash erupted into the sky falls back to Earth like powdery snow. If thick enough, blankets of ash can suffocate plants, animals, and humans. When hot volcanic materials mix with water from streams or melted snow and ice, mudflows form. Mudflows have buried entire communities located near erupting volcanoes.

Explanation: