Explain what happens when a volcano erupts AND the two different types of eruptions that can occur.

"When magma reaches earth's surface it is called lava. It may pour out in gentle streams called lava flows or erupt violently into the air. Rocks ripped loose from the inside of the volcano or torn apart by the gas may be shot into the air with the lava".

-Google

The two types of eruptions are:

Explosive eruptions and effusive eruptions.