Science crossword

6. a sudden shaking of earth's crust
8. the middle layer of earth
9. a hole in the earth where melted rocks flow out and cools to form a mountain
11. rocks formed from layers of sediment that get buried, pressed, and cemented together over a long period of time
14. melted rock that flows out to the earth's surface
15. traces or remains of living things that died a long time ago
17. rocks that have cooled and formed from melted rock
18. the moving of broken rock when weathering occurs
19. a solid object that forms crystals

1. rocks formed when heat and pressure change existing stones into different rocks
2. narrow valleys with steep sides
3. melted rock inside the earth
4. cracks in earth's crust
5. huge pieces of earth's crust and mantle that move
7. boundaries the places where two plates meet
10. the top layer of earth
12. the breaking down of rocks into smaller pieces
13. tectonics the theory that explains the motion of the plates
16. the bottom layer of earth