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Clay because it's lighter.
Sand is far and away more permeable than clay. Water poured into sand disappears in moments. Clay layers in the earth can effectively block the penetration of moisture. Big time.
The word you are looking for is "sedimentation." Sedimentation is the process by which sand or particles settle out of wind or water and form layers or deposits over time.
the sediment could change in order bto the types of erosions. as a river slows larger pieces settle first gravel settes first, then sand, and then tiny clay sized clay particles
There are many layers, or horizons, in soul. The tree main types of rock layers are sand, silt, and clay.
Loess deposits is form when sediment that is finer than sand, such as particles of clay and silt, is deposited into layers far from its source.
the sediment could change in order bto the types of erosions. as a river slows larger pieces settle first gravel settes first, then sand, and then tiny clay sized clay particles
swamp+sand=clay
Highly impermeable layers such as clay or shale are referred to as an aquitard. While permeable sand and limestone that can transmitt large amounts of water to a well are referred to as an aquifer.
I is Soil. Because of the cracks and spaces.
mud+sand=clay
Clay is soft and sand is like sand water