Techtonic Plates

4. The physical study of the earth and its atmosphere.
6. The earths surface is cracked into large pieces called _______.
8. Evidence that all the continents were once one super continent is because they fit together like a __________.
9. Who came up with the theory of the continental drift?
13. Distribution of similar ____________ across the continents suggest they were once connected.
15. At one time all the continents were together this was a supercontinent called ________________.
16. Earthquakes and volcanoes happen on the ________ of the plates.
20. The outermost shell of a terrestrial planet.

1. Plate lines are visible on ________ maps.
2. Most tectonic plates are made up of contenant and _______.
3. The idea of continental drift was developed in _________.
5. A permanent layer of ice covering an extensive area of land.
7. A new theory of plate tectonics was developed over _______years ago.
10. The theory of the continental drift is believed that the continents are __________.
11. Fractures on rock surfaces that can be seen on a map
12. There are __________ volcanoes in the ring of fire.
14. 90% of all earthquakes happen in the ______________________________.
17. Movements of tectonic plates cause _________________ and volcanoes.
18. Sudden movements of the earth's crust on the fault line.
19. Continents can drift by moving slowly on a layer of liquid ________.