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15 Cards in this Set
- Front
- Back
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Bathymetry |
The discovery and study of submerged contours. |
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Lithogenous/ terrigenous sediment |
Sediment derived from the land and transported to the ocean by wind and flowing water. |
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Continental Margin |
The submerged outer edge of a continent, made of granitic crust; includes the continental shelf and continental slope. |
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Trench |
An arc-shaped depression in the ocean ( deep ocean) floor with very steep sides and a flat sediment- filled bottom coinciding with a subduction zone. Most trenches accuse in the Pacific. |
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Biogenous Sediment |
Sediment of biological origin. Organisms can deposit calcareous (calcium-containing) or siliceous (silicon-containing) residue. |
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Lysocline |
The depth of the ocean below which the rate of dissolution of calcite increases dramatically. |
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CCD (calcite compensation depth) |
The depth at which the rate of accumulation of calcareous sediments equals the rate of dissolution of those sediments. Below this depth, sediment contains little or no calcium carbonate. |
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Mid-ocean rigid |
A long seismically active submarine rigid system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with sea floor spreading. |
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Hydrothermal vents |
A spring of hot. Mineral-and gas-rich seawater found on some oceanic ridges in zones of active sea floor spreading. |
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Isostasy |
The equilibrium that exists between parts of the Earth's crust, which behaves as if it consists of blocks floating on the underlying mantle, rising if material such Adan ice cap, is removed and sinking if material is deposited. |
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Theory of Plate Tectonics |
The theory that Earth's lithosphere is fractured into plates that move relative to each other and are driven by convection currents in the mantle. Most volcanic and seismic activity occur at plate margins. |
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Divergence |
A region where plates are moving apart and where Ned ocean or Rift Valley will eventually form. A spreading center forms the junction. |
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Convergence |
A region where plates are pushing together and where a mountain range, island are, and/or trench will eventually form; often a site of much seismic and volcanic activity. |
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Passive Continental margin |
The continental margin near an area of lithosphere plate divergence. |
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Continental margin |
The submerged outer edge of a continent, made of granitic crust; includes the continental shelf and continental slope. |
