Final review

4. when pressure from earth's plates is released
6. the color of a mineral's powder
7. type of rock made from volcanic activity
9. type of weathering where water freezes and expands breaking rocks
12. the ability to scratch another material
13. the breaking down of rocks
15. mass divided by volume
17. molten rock
19. giant super continent
20. the theory that states earth's crust is broken into pieces that are constantly moving
21. a cycle of heating and rising then cooling and sinking
22. boundary where plates move apart
24. a break in earth's crust where magma can escape
25. type of rock formed in layers, may contain fossils

1. a giant river of ice
2. outer most layer of earth
3. type of rock made from heat and pressure
5. boundary where plates come together
8. type of weathering that turns iron brownish red
10. the wearing away of earth's surface
11. pure substances found in nature
14. thickest layer of earth, where convection currents happen
16. boundary where plates slide past each other
18. sections of the earth's crust
21. theory that says the continents were once joined and drifted apart over time
23. composed of 2 or more minerals