When a volcano erupts

This task is about geological events linked to volcanic eruptions.

Question 1Change answer

Volcano
a)  Before a volcanic eruption there are often signs that an eruption could happen soon. 
     What are two possible signs?
1.
2.

Question 1Change answer

b)  When a volcano erupts many geological events take place on and around the volcano. 
     Describe four geological events which are linked to volcanic eruptions.
1.
2.
3.
4.