PLATE TECTONICS

2. Magma that has flowed onto the Earth’s surface.
6. These occur around the “Ring of Fire”.
9. Type of current in the mantle that causes tectonic plates to move.
11. Forms under the ocean at the site of a diverging boundary – a mid-ocean ……
12. Huge wave caused by an undersea earthquake.
13. Type of plate boundary where plates move away from each other.
14. This forms on the ocean floor above a subduction zone – an ocean …….
15. Large, but separate pieces of lithosphere are called …. plates.
16. Thinnest type of crust.

1. Lava from a volcano cools and solidifies into this.
2. The crust and uppermost solid mantle.
3. Layer of the Earth where convection currents occur.
4. Much of New Zealand’s south island rests on this plate.
5. Type of plate boundary where plates move towards each other.
7. Occurs when one plate sinks below another plate.
8. Very hot molten rock that rises by convection within the mantle.
10. Wegener proposed the theory of continental …… to explain why the same fossils exist on separate continents.
17. Very fine, light rock particles that issue from a volcano & form a rapidly rising cloud - volcanic …