Stones have relatively stable and strong features. However, if they have ben exposed under air and other atmospheric conditions, they can be reshaped during a really long period of time. For example, their surfaces can be dry out and form lines and even layers.
Duck can live both in water and on land. When it lives in water, it can play and prey in the water. And water supports its body to float and move.
A Bird is one kind of animal which can live in the sky. It usually flies and sometimes rest on the ground. Air sustains it to breath and move.
Plant, as a form of biotic components, breeds and lives from the ground. It gets nutrition and water for life from soil. And the soil also offers micro-organisms to interact with the plant.
The water flows on top of the seabed surface. It can force stones to reshape and become smaller particles. Increased erosion of loose soil can cause increased density sediments in the water, making the water muddy.
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