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6th CK Tectonics 1
6th CK SCIENCE Plate Tectonics/Volcanoes Part 1 (a-d) COMPLETE
| Term | Definition |
|---|---|
| Alfred Wegener | scientist who proposed the theory of continental drift |
| Anticline | an upward fold in rock |
| Ash (volcanic) | finely pulverized lava thrown out by a volcano in eruption. made of tiny fragments of jagged rock, minerals, and volcanic glass; rock particles more than 0.25 mm but less than 5 mm across that are blown into the air by a volcanic eruption |
| Basalt | the dark, dense igneous rock of a lava flow or minor intrusion |
| Caldera | a roughly circular, steep-sided pit at the top of a volcanic cone whose diameter is at least three times its depth |
| Cinder cones | volcanoes made mostly of cinders and other rock particles that have been blown into the air |
| Cleavage | the tendency of a mineral to break alone smooth, definite surfaces |
| Climate | the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine,cloudiness, and winds, throughout the year, averaged over a series of years. |
| Collisional Boundary | occurs when two continental plates collide |
| Composite Volcanoes | Volcanoes built up alternating layers of rock particles and lava |
| Compression stress | pushes rock together causing middle to become thicker |
| Continental Drift Theory | theory stating that Pangaea split up and the pieces drifted into their present day location and will continue to move; continents are consistently moving apart or drifting away from each other |
| Continental plate | parts of the planet's crust that lie under the surface of land masses below the sea around the world |
| Convection current | a movement of material caused by differences in temperature |
| Convergent Boundary | occurs when an oceanic plate either moves under a continental plate or another oceanic plate |
| Core | the central region of the Earth |
| Crater | a funnel-shaped pit or depression at the top of a volcanic cone |
| Crust | the outermost and thinnest layer of the earth composed of rocky matter less dense than the mantle below; the surface layer of the Earth |
| Crystal | a solid in which the atoms or molecules are arranged in a definite pattern that is repeated over and over again |
| Deformation | any change in shape or volume of earth’s crust |
| Density | the amount of matter in a given space; the mass per unit volume |
| Divergent Boundary | occurs when two plates move away from each other |
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