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Plate Tectonics
| Term | Definition |
|---|---|
| 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. |
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mrstwilliams
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