plate tectonics

1. volcano is currently active
5. types of rock that are formed by the accumulation or deposition of mineral
6. rigid outer part of the earth, consisting of the crust and upper mantle
7. volcanoes that have not erupted in a long time but are expected to erupt again
8. solid material found in the centre of some planets
11. A theory explaining the structure of the earth's crust
13. formed from the solidification of molten rock material
15. he mostly-solid bulk of Earth's interior
16. sideways and downward movement of the edge of a plate of the earth's crust
17. upper layer of the earth's mantle, below the lithosphere
18. the third layer of the Earth

2. volcanoes that wont erupt again
3. two plates slide past one another
4. current in a fluid that results from convection
7. two tectonic plates move away from each other
9. intensely hot area in the mantle below Earth's crust
10. plate ________ theory
12. mountain that has a crater or vent through which lava comes out
14. large slabs of Earth's lithosphere—split apart from each other
15. started out as some other type of rock, but have been substantially changed from their original igneous