Science Midterm

3. Convection __________ occur in the mantle.
4. __________ occurs when the old rock layer is pushed back down into the mantle and melted into magma.
5. __________ boundaries occur when plates come together.
6. Seafloor __________ occurs when magma erupts from the Mid-Atlantic ridge and cools and hardens into a new rock layer.
8. __________ boundaries occur when plates move apart.
10. __________ are pieces of sand, rock, and other materials.
11. __________ drift theory is the theory that the continents once fit together but broke apart and slowly drifted apart.
13. __________ is the movement of weathered rocks.
14. __________ boundaries occur when plates slide past each other.
16. Transform boundaries can cause __________ to occur.
17. Subduction occurs at the __________.
18. Convergent boundaries can cause __________ to form.
19. Seafloor spreading occurs at the Mid-Atlantic __________.

1. __________ rocks are formed from magma cooling and hardening.
2. Sedimentary rocks are formed from cementation and __________ of sediments.
3. __________ currents occur when hot magma rises and cool magma sinks over and over.
7. Divergent boundaries can cause __________ spreading to happen.
9. __________ rocks are formed from heat and pressure.
12. When any type of rock is melted, it becomes __________.
15. __________ is the breaking down of rocks.