Earth Science

3. The mud flow from a volcano.
5. Tectonic plates float on this layer of molten rock.
7. Boundaries that occur when two plates pull apart.
8. Rocks that are formed from magma.
9. The height of the zig-zag line on a seismograph.
11. Solid rock layer that we live on.
15. AN instrument used to record an earthquake or the shaking of the ground.
18. When a volcano has not recently erupted but could erupt again.
19. Large portions of land on the earths surface.
20. In the North Island this plate is subducting under the Australian plate.

1. The first person to propose the theory of plate tectonics.
2. Molten rock on the surface.
4. This crust is dense and is found under the sea floor.
6. These rocks form from grains of eroded rock or undecomposed plant or animal parts.
10. Sticky airborne solids from explosive eruptions like a lava bomb.
12. Wave that is caused by an earthquake.
13. The inner and outer core are made up of molten iron and.
14. This current is in the mantle and is caused by difference in temperature.
16. The first landmass that existed.
17. Crack formed when part of the crust breaks as it shifts.