Techtonic Plates

1. There are __________ volcanoes in the ring of fire.
6. the physical study of the earth and its atmosphere.
7. The earths surface is cracked into large pieces called _______.
9. who came up with the theory of the continental drift?
13. The outermost shell of a terrestrial planet.
15. Distribution of similar ____________ across the continents suggest they were once connected.
18. At one time all the continents were together this was a supercontinent called ________________.
19. Earthquakes and volcanoes happen on the ________ of the plates.
20. Most tectonic plates are made up of contenant and _______.

2. maps Plate lines are visible on ________ maps.
3. Evidence that all the continents were once one super continent is because they fit together like a __________.
4. Sudden movements of the earth's crust on the fault line.
5. The idea of continental drift was developed in _________.
8. A new theory of plate tectonics was developed over _______years ago.
10. Movements of tectonic plates cause _________________ and volcanoes.
11. The theory of the continental drift is believed that the continents are __________.
12. Fractures on rock surfaces that can be seen on a map
14. Continents can drift by moving slowly on a layer of liquid ________.
16. A permanent layer of ice covering an extensive area of land.
17. 90% of all earthquakes happen in the ______________________________.