Earth features

6. the place where sea floor spreading starts
10. when there is a divergent boundary on land it creates these
11. the layer of Earth just below the crust
13. when two plates slide past each other
15. the object that the continents sit on and move due to the convection current in the mantle
17. when two plates collide
18. animal or plant remains that have been preserved in rock
19. the layer of Earth that we live on
20. a tool that sends sound waves out that hit a surface and bounces back to tell the distance an object is away

1. the supercontinent that formed about 300 million years and split apart about 200 million years ago
2. the rock that the continents are made of
3. the theory the the continents were once connected and moved apart
4. when two plates move away from each other
5. the scientist that theorised that the continents fit together and have since split apart
7. new material is added to the sea floor
8. the result of a transform boundary
9. where subduction takes place
12. the warmest and most pressurized layer of Earth
14. the material that the ocean floor is made of
16. where the sea floor begins to sink back into the mantle