Plate Tectonic

4. Boundary created where plates come together
7. Earthquakes cause earth to shake so hard that loosely packed soil acts like liquid.
10. A strong and sudden movement in Earth's Crust.
11. US Geological society says there are _________ of tremors a year.
12. Small ground movements.

1. Scientific theory of movement of tectonic plates is called?
2. Heating and cooling of magma that causes the earth's crust to move.
3. Tidal waves caused by underwater earthquake
5. Earth's surface directly above the focus of an earthquake.
6. Earth's crust and upper mantle together are called?
8. Boundary created where plates pull apart
9. When low density tectonic plates move over the high density tectonic plate, it is called __________.