Volcanoes have a secret!
Some pour out slow and calm. Some go BANG. Why?
Hot melted rock is full of fizzy gas bubbles.
melted rock
gas bubbles
The gas always wants to get OUT — just like a shaken soda.
Tap to shake it — wake the bubbles up!
Tap — see the bubbles get busy.
This rock is thick and gluey. Will it OOZE or POP?
Tap your guess!