plate tectonies

2. a downward steep wall formed displacement
4. a sudden and violent shaking of the ground
5. a seismic body wave that shakes the ground back and forth
6. an opening in the earth's crust through which lava, volcanic ash, and gases escape.
7. a string of volcanoes and sites of seismic activity
9. the remains or traces of plants and animals that lived long ago
11. the center of interest or activity.
13. is a hot molten rock
15. the great size or extent of something
16. the force transmitted through a rope, string or wire when pulled
19. the movement caused within a fluid by the tendency of hotter
20. the action of compressing or being compressed.
21. heat waves that are coming from the sun

1. molten rock that is underground
3. two plates sliding down from each other
8. is a hanging wall and a foot wall
10. the outside part or uppermost layer
12. it is a transverse waves
14. mass of a unit volume of a material substance.
17. the process by which heat or electricity is directly transmitted through a substance
18. pressure or tension exerted on a material object.