Topic summary
Rock pool
Extracted from the Wikipedia article Tide pool.
A tide pool or rock pool is a shallow pool of seawater that forms on the rocky intertidalshore. These pools typically range from a few inches to a few feet deep and a few feet across. Many of these pools exist as separate bodies of water only at low tide, as seawater gets trapped when the tide recedes. Tides are caused by the gravitational pull of the sun and moon. A tidal cycle is usually about 25 hours and consists of two high tides and two low tides.