Cracking Up

3. Created when tectonic plates try to slide past each other.
5. Pressure from gases in the mantle squeezes molten rock upwards until the surface of the Earth swells and explodes.
6. The scale that measures the size of an earthquake (starts at 0, with an increase of one unit representing a 10 times increase in the size of the Earthquake).
9. The type of plate boundary where the plates move away from each other are known as d_____________ boundaries.
10. The type of natural disaster caused by plates trying to slide past each other.
13. Large pieces of rock blown out of a volcano are known as _________ bombs.
14. _____________ currents cause the movement of tectonic plates.
15. A wave formed when the epicentre of an earthquake is under the ocean floor.

1. Evidence for plate tectonics included the presence of __________ of the same plants and animals on continents where they used to join.
2. The name given to magma when it emerges from a volcano.
4. The type of plate boundary where the plates move towards each other are known as c______________ boundaries.
7. Smaller earthquakes that occur as slabs of rock try to settle into a stable position after an earthquake.
8. Hot liquid rock in the mantle __________ due to a lower density.
11. The point on the Earth’s surface that is directly above the focus of an earthquake.
12. Alfred Wegener developed the theory of plate _____________.