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Plate Tectonics

Pangaea A hypothetical supercontinent that includes all current land masses. The idea was developed by Alfred Wegener.
Alfred Wegener A German scientist who proposed a hypothesis about continental drift and Pangaea.
continental drift The slow movement of the continents across the earth's surface over time.
tectonic plates Layers of the earth’s crust that move, float, and sometimes fracture.
Ring of Fire In the Pacific Ocean where a large number of earthquakes and volcanic eruptions occur.
Geologist A scientist who studies the earth as well as the processes and history that have shaped it.
Volcano A mountain or hill, having a crater through which lava, rock fragments, hot vapor, and gas erupting from the earth's crust.
Continental Plate One of the large pieces of the surface of the earth that move separately.
Oceanic Plate It is the uppermost layer of the oceanic portion of a tectonic plate. The crust overlies the solidified and uppermost layer of the mantle.
Ocean Trenches A long, narrow ditch on the ocean floor, typically one running parallel to a plate boundary and marking a subduction zone.
Ridge A long narrow hilltop or mountain range.
seismic waves An elastic wave in the earth produced by an earthquake or other earth vibration.
density The density of a substance - its mass per unit volume
core The central or innermost portion of the Earth, below the mantle.
mantle The region of the interior of the Earth between the core (on its inner surface) and the crust. (on its outer)
crust The top layer of the earth. It is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is above the mantle.
Lithosphere It is the rigid outer part of the earth. It is the crust and upper mantle of the earth.
convection currents result from convective flow – where fluid moves in a continuous circular pattern of as they are heated and cooled.
subduction The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
Created by: mrstwilliams
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