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Tide
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Rhythmic rise and fall of the sea level in the Earth's oceans and their inlets and estuaries due to the gravitational attraction of the Moon and, to a lesser extent, the Sun, affecting regions of the Earth unequally as it rotates. Water on the side of the Earth nearest to the Moon feels the Moon's pull and accumulates directly below the Moon, producing a high tide.
High tide occurs at intervals of 12 hr 24 min 30 sec. The maximum high tides, or spring tides, occur at or near new and full Moon when the Moon and Sun are in line and exert the greatest combined gravitational pull. Lower high tides, or neap tides, occur when the Moon is in its first or third quarter and the Moon and Sun are at right angles to each other.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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tide
wave (earth science)
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arch (earth science)
attrition
bar (earth science)
bay (earth science)
beach
cave
cavitation (earth science)
coast
coastal cliff
coastal deposition
coastal erosion
coastal protection
corrasion
corrosion
dune
erosion
estuary
fjord
groyne
headland
longshore drift
ria
salt marsh
solution (earth science)
spit
stack (earth science)
storm surge
stump
tide
wave (earth science)
wave-cut platform
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