An __________ happens when lava 'bursts through the surface" of a volcano.
Scientists keep a __________ "watch" on the volcano "without stopping."
If the volcano erupts, then the people who live near it are in____________ danger because the lava can burn them "right away."
"Slowly over many years," the sides of the volcano rises ______________.
If you look inside the volcano, you can see its _________ which is "its deepest parts."
When something is ___________, it was hidden but can "now be seen."
At the top of the mountain the air is icy and rocks _________, break apart, and "get smaller by shrinking."