A river current is the water moving in a river. Rivers flow from high points to lower ones and eventually down to a larger body of water. The force of gravity, which makes the water flow downward, creates river currents. A current is the steady, predictable flow of one fluid within the body of another fluid. Fluids are materials capable of flowing and easily changing shape. The most common natural fluid is water. River currents are influenced by the volume, or amount, of water flowing in a river; the river's steepness, called its stream gradient; and a riverbed's topography, including sand bars, basins, rocks, and dams.
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Subduction zones are important for several reasons: ... Subduction zones drag down subducted oceanic sediments, oceanic crust, and mantle lithosphere that interact with the hot asthenospheric mantle from the over-riding plate to produce calc-alkaline series melts, ore deposits, and continental crust.
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If a foreign substance is detected, the immune system will be activated. It will attack and, if possible, annihilate the foreign substance with an impressive army of cells. In the case of an allergic reaction, the immune system is 'mistaken'. It overreacts to a harmless substance in pollen, for example.
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It creates half the number of cells in the diploid parent call. To which it then follows the rest of the reproduction cycle
<span>transmit genetic information</span>
