Plate Tectonics

3. primary driving force for movement of tectonic plates.
6. the broken crustal fragments sink, generating an elongated depression.
9. a continuous elevated zone on the floor of all the major ocean basins and varying in widths from 500 to 5,000km.
10. Divergent plate boundary can also be called this.
12. supercontinent containing all of the existing continents.
14. a hypothesis which suggested that all
15. Ascends through the crust
16. a boundary in which two plates move together, resulting in oceanic lithosphere being thrust beneath an overriding plate.
18. a hypothesis, first proposed in the 1960s by Harry Hess, which suggested that new oceanic crust is produced at the crests of mid-ocean ridges, which are the sites of divergence.
20. a narrow, elongated depression of the sea floor.
21. a chain of cola nice islands generally located a few hundred km from a trench where there is active subduction of one oceanic plate beneath another.
22. Less likely to subduct due to it’s buoyancy.

1. a well-tested theory proposing that Earth’s outer shell consists of individual plates that interact in various ways and thereby produce earthquakes, volcanoes, mountains, and the crust itself.
2. Along the crest of some ridge segments is a deep canyon like structure called what?
4. Linear zones of irregular topography on the deep-ocean floor that follows transform faults and their inactive extensions.
5. mountains formed in part by igneous activity associated with the subduction of oceanic lithosphere beneath a continent.
7. occurs when igneous rocks melt over a temp range.
8. German meteorologist and geophysicist
11. a boundary in which two plates move aboard, resulting in upwelling of material from the mantle to create new sea floor.
13. processes that deform Earth’s crust to create major structural features, such as mountains, continents, and ocean basins.
17. elevated areas of the sea floor characterized by high heat flow and volcanism.
19. continents once existed as a single supercontinent.