Earth Science

1. 225 million years ago, all continents were a part of this supercontinent
5. ______ currents in the mantle drive plate movement
6. Earthquakes are measured in magnitude according to the ______ scale.
7. The outer layer of the earth, makes up less than 1% of the total volume of the earth
9. A ________ boundary is when plates come together
11. The last name if the scientist that first pursued the theory of continental drift
12. The earth's crust is in two categories, the denser and thinner being _______ crust, made of basalt.
15. This layer of the earth has a density of around 3.8g/cm³, and makes up about 80% of the total volume of the earth
17. _______ waves are compression waves that are like the pulse that can travel along a stretched string
18. The region around the rim of the Pacific Ocean where plate tectonics have created a series of subductions zones and many volcanic eruptions and earthquakes happen
19. The portion of the outer mantle in which continental plates move
21. One crust is destroyed as it dives under another

2. The surface of the earth directly above the source of an earthquake is called the _________.
3. A location on the earth that appears to have continual volcanic or intense geothermic activity, but is not part of a plate boundary
4. The crust and the uppermost portion of the mantle
8. The earth's crust is in two categories, the less dense being _______ crust, made of granite.
10. _______ waves are transverse waves, like waves produced when you wiggle one end of a rope
13. The densest region of planet earth, in two layers: a liquid outer layer and solid inner layer
14. The study of earthquakes using waves
16. A ________ boundary is when new crust is generated as plates move apart from each other
17. The theory that earth's crust and upper mantle are in sections that move
20. A ________ boundary is when two plates slide horizontally past each other