Science Midterm

2. When any type of rock is melted, it becomes __________.
4. __________ is the movement of weathered rocks.
8. The __________ is the hottest and densest layer of the Earth.
10. __________ currents occur when hot magma rises and cool magma sinks over and over.
13. When a hemisphere receives more indirect sunlight, it is __________.
16. __________ boundaries occur when plates come together.
18. The greater the mass of an object, the less acceleration an object has in motion. The greater the force an object is given, the more acceleration an object has in motion. This is called Newton’s __________ law.
19. The change of speed is called __________.
23. __________ boundaries occur when plates slide past each other.
25. __________ drift theory is the theory that the continents once fit together but broke apart and slowly drifted apart.
27. If an object is in motion, it stays in motion until an unbalanced force acts on it. If an object is at rest, it stays at rest until an unbalanced force acts on it. This is called Newton’s __________ law.
29. An object is in __________ when it changes its position.
30. Divergent boundaries can cause __________ spreading to happen.
33. Seafloor __________ occurs when magma erupts from the Mid-Atlantic ridge and cools and hardens into a new rock layer.
34. __________ rocks are formed from magma cooling and hardening.
35. Earth has seasons because of its __________.

1. __________ is the supercontinent containing all the continents.
3. __________ boundaries occur when plates move apart.
5. __________ occurs when the old rock layer is pushed back down into the mantle and melted into magma.
6. Subduction occurs at the __________.
7. __________ are pieces of sand, rock, and other materials.
8. Convection __________ occur in the mantle.
9. The revolution of the Moon around the Earth takes one __________.
11. __________ is how heavy or light an object is for its size.
12. For every action, there is an equal and opposite reaction. This is called Newton’s __________ law.
14. __________ rocks are formed from heat and pressure.
15. Convergent boundaries can cause __________ to form.
17. The __________ of the Earth around the Sun takes one year.
20. Sedimentary rocks are formed from cementation and __________ of sediments.
21. Transform boundaries can cause __________ to occur.
22. The __________ of Earth takes one day.
24. __________ is the breaking down of rocks.
26. The __________ is the layer that is made up of rock.
28. When a hemisphere receives more direct sunlight, it is __________.
31. The __________ is the layer that consists of magma.
32. Seafloor spreading occurs at the Mid-Atlantic __________.