Tectonic Plates

2. a natural feature of the earth's surface.
5. A _ occurs when two tectonic plates move away from each other.
6. Earth's _ is a fluid layer about 2,400 km (1,500 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core
7. one of the major tectonic divisions of the earth's crust, comprising four sea-floor basins; separated from the Nazca, Cocos, and North and South American plates ...
9. _ definition, a seaport in W California, on San Francisco Bay: earthquake and fire 1906; United Nations Conference 1945.
11. a _ is sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
12. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
15. (planetology) The solid material found in the centre of some planets at extremely high temperature and pressure, distinct from the liquid outer core.
16. a _ (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
18. deep-sea trench, also called _ , any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 metres (24,000 to 36,000 feet). They typically form in locations where one tectonic plate subducts under another.

1. The _ is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. ... It forms the tectonic boundary ...
3. a large natural elevation of the earth's surface rising abruptly from the surrounding level; a large steep hill.
4. the rigid outer part of the earth, consisting of the crust and upper mantle
8. The _ is a major tectonic plate straddling the Equator as well as the prime meridian.
10. hit with force when moving.
12. _ was a German polar researcher, geophysicist and meteorologist.
13. A_ is a naturally raised area of land, not as high or craggy as a mountain.
14. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
17. The _ or India Plate is a minor tectonic plate straddling the Equator in the Eastern Hemisphere.