Intertidal Zone Information:

Intertidal zones are areas along the coast where the tides wash in and out. These areas are covered by water for 6 hours, then dry for 6 hours, then wet for 6, and dry for 6, and so on. It is difficult for animals and plants to survive here without special adaptations. Producers include only the algae that can survive here. Animals include crustaceans like small crabs, mollusks such as small bivalves, and birds like the seagull. Large sea turtles lay their eggs here. The soils is often sand but can be crushed rock or solid rock. Air temperature and sunlight varies with the latitude on which the beach is found. Nutrients are readily available here, with detritus washing in from the ocean and land.

A rocky/pebbly intertidal zone

Ian Balcombe [CC-BY-SA-2.0], via Wikimedia Commons

A muddy intertidal zone, often found at estuaries.

Kieran Campbell [CC-BY-SA-2.0], via Wikimedia Commons

Sea life in the pools of an intertidal zone at low tide.

By NOAA [Public Domain] via Wikimedia Commons.

A sandy intertidal zone.

By Tom Lanik (Own work) [CC-BY-3.0], via Wikimedia Commons

A rocky intertidal zone in Northern California.
By skuensting

Intertidal zones are found worldwide where the land meets the sea. Tides are strongest in the centers of the large oceans where land faces large stretches of water.