- At low tide the seashore is exposed to air, wind, rain, sun and freezing cold.
- To survive, seashore plants and animals must keep from drying out a low tide.
- Tidal pools, crevices, cobblestones and seaweeds provide protection for animals that cannot stand exposure to drying out during low tide periods.
The children will be able to 1) describe the seashore plants and animals at low tide, 2) identify conditions at high tide and at low tide, 3) describe and dramatize how seashore plants and animals keep from drying out at low tide, and 4) draw pictures of seashore animals at high tide and at low tide.
Transparency: "Dock Piling at Low Tide"
Twice each day the tide rises and falls. Twice each day the seashore is either covered with seawater or exposed to air. It's tough for animals to live in a place where sometimes they're under water, sometimes they're high and dry, sometimes fresh water rains down, sometimes salt water covers them, sometimes cold waves crash over them, sometimes the air is freezing cold, and sometimes they're left out in the hot sun.
At low tide (or when out of seawater) plants and animals must be able to retain moisture for long periods of time, especially those that live high on the shore. During periods of heavy rain they must tolerate rapid changes in the salt content of the water.