Mountains

2. formed from one such massive wreck that started about 55 million years ago.
4. Sometimes_______break down mountains instead of building them up
6. steep, sloping sides and sharp or rounded ridges, and a high point, called
9. a series or chain of mountains that are close together.
10. is the highest mountain
11. The world's tallest mountain ranges form when pieces of Earth's crust—called plates—smash against each other in a process called
13. The tallest mountain measured from top to bottom is
14. form as colliding tectonic plates push up the land without folding or faulting.
15. When magma pushes the crust up but hardens before erupting onto the surface, it forms so-called

1. by the movement of large crustal blocks when forces in the Earth’s crust pull it apart.
3. What country has more than 3398 mountains?
5. scientists who study the Earth
7. the 1980 eruption that blew the top off of
8. form when molten rock from deep inside the Earth erupts through the crust and piles up on itself
12. often serve as geographic features that define natural borders of countries