This is the development of bare area without any form of life. Exposure of new surfaces may occur due to several causes such as landslides, erosion, deposition, or other catastrophic aging.
Buoyancy The density of fresh water is considerably less than that of the sea and such floatation is a greater problem for fresh water plankton. There is occasional flooding which submerges the plants. The water lilies, water lettuce, water hyacinth are able to stay afloat because of the air spaces in the lower part of the leaves as well as in the skins and roots.
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