Plate tectonics

2. a large dip in a mid ocean ridge
3. a large range of mountains that spread across the ocean floor
5. magma on the surface
6. when one plate sinks below another
9. transfering heat from materials that are touching
10. plates that move towards each other
13. a break in earth's crust
14. the process in which hot fluids become LESS dense and rise and colder fluids become MORE dense and sink
16. the process in which a mid ocean ridge releases magma onto the ocean floor making it expand
17. plates that move away from each other
18. the name of the super-continent
19. traces of ancient organisms preserved in rock
20. how much mass is measured to be in an object

1. heat being transfered by a fluid
4. a string of islands created by volcanoes
7. the idea that the continents slowly drift
8. an area in earth's crust where material rises through and melts creating magma
11. the large crack that runs through a mid ocean ridge
12. a molten mixture of rock gases and water from the mantle
15. plates that slide past each other