Mass movement and runoff.
Silt and clay.
The correct answer is silt and clay.
The two primary sources of sediment for beaches are rivers and coastal erosion. Rivers transport sediments from the land and deposit them along the coast, while coastal erosion breaks down rocks and cliffs along the shoreline, contributing sediment to the beach.
Deltas are formed by the deposition of sediment carried by rivers as they enter an ocean or lake. The primary factors responsible for delta formation are the decrease in water velocity as the river enters a body of water and the reduction in sediment-carrying capacity due to the decrease in energy.
the kunlun mountains
Rain and springs Rivers and lakes.
Rivers carry sediment, which when deposited at the beach, increases the land. Similarly, rivers can carry sediment away from a beach, also changing its shape. These two forces can work together to effectively move sediment from one area of the beach to another. Similarly, storms also move sediment.
Riverine islands are formed when a river has a braided channel and by the deposition of sand and silt carried by the river.
Rivers and continental crust to continental crust.
The Namib is traversed by the Orange and Fish Rivers
The major sources of water in the region are two exotic rivers, the Tigris and Euphrates.
The two possible sources of sediment that fills a geosyncline are erosion from nearby landmasses and the accumulation of marine sediments from adjacent oceanic areas. Erosion processes can transport material from mountains and highlands into the geosyncline, while marine sediments may come from the remains of organisms, as well as from river runoff and continental shelf deposits. Both sources contribute to the thick layers of sediment characteristic of geosynclinal basins.