Hawaiian eruption :
Magma is filled with bubbles of poisonous gas. If the magma is thin and runny the gas can escape from it.This makes the lava run more gently down the sides of the volcano. This is the most harmless type of eruption because people have more time to escape the lava flow.

Strombolian eruption:
When the magma is thick and sticky like a tar, gas is trapped inside. The gas keeps bubbling up until it explodes, splattering molten rock and ash everywhere. Tha lava is so thick it oozes out.

 

Plinian eruption:
A Plinian eruption is the most explosive eruption of all. In this kind of volcano, magma is so thick and gluey that it clogs the crater. As it cools down it becomes a solid plug of rock. For hundreds of years the gas builds up behind this plug then ....BOOM!