15.1k views
3 votes
How are volcanoes formed?

2 Answers

6 votes
when magma is formed from within the earths upper mantle it works it way up to the top. when the volcanoes erupts the lava builds the volcanoes bigger and bigger. 
User Adamp
by
7.6k points
3 votes
volcanoes are for when magma form within the earths upper mantle

hopes this helps
User Jayashree
by
6.6k points