Now we will move to a new ecosystem, the Intertidal Zone. The gravity of the moon and the sun creates tides. Tides are the slight rising and lowering of the water level. A low tide occurred at 3:59 this morning when the water was actually -1.7 feet below sea level. High tide will occur at 9:21 tonight when water the will be 7.2 feet ABOVE sea level. That’s almost a 9 foot difference in water level. So plants and animals that live in tide pools must be able to survive being submerged under salt water part of the day and then being exposed to air the rest of the day.
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