mass movement and runoff
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Erosion from land surfaces, such as rainfall, wind, and agricultural activities, can cause sediments to wash or fall into a river. Human activities like deforestation and construction can also contribute to increased sediment runoff into rivers.
A delta is a landform that is most likely made by the process of depositing sediments. Deltas are formed at the mouth of a river where the river's sediments are deposited as the river slows down and enters a larger body of water, such as a lake or an ocean. The accumulation of sediments over time creates a triangular-shaped landform with various channels and distributaries.
Most river sediments are deposited at the mouth of the river, where it meets a body of water such as a lake or ocean. The sediment settles due to the decrease in water velocity as the river enters a larger body of water, causing it to drop the sediments it was carrying.
River sediments are particles and materials that are carried by a river's flow and eventually settle to the riverbed. These sediments can include sand, silt, and gravel, and they play a crucial role in shaping the river's channel and surrounding landscape. River sediments can also provide important habitats for aquatic organisms.
Most sediments that compose a delta are a mixture of silt, sand, and clay particles carried by a river and deposited at its mouth where the river meets a body of standing water such as a lake or ocean. These sediments accumulate over time to form the characteristic fan-shaped delta landform.
Shells are organic sediments.