A tide pool, or rock pool, is a shallow pool of seawater that collects on a rocky intertidal shore. These pools are usually only a few inches to a few feet deep and a few feet across. Most exist as separate bodies of water only while the tide is out, since seawater becomes trapped in rocky depressions as the tide recedes. The rise and fall of the tide is driven by the combined gravitational pull of the sun and the moon, with a tidal cycle running roughly twenty five hours and producing two high tides and two low tides.
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