Question

a collect some information on how is sand that flows in a river formed. Also collect
information about where the sand comes from.
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Answer 1

Answer:

Sand is formed over a long period of time by water, wind, gravity, and tectonics, among other forces. Water provides movement of sediment from the beginning of streams and inland areas down through the land. ... While heavier sediment settles along river banks and streams, lighter sediment gets carried to the ocean.

Answer 2

Answer:

The constant change in temperature along with the winds and the rains and fiercely flowing water, develops cracks on the rock surface, causing them to break into smaller particles (weathering of rocks). These soil particles are transported by the flowing river to the low lying areas and deposited there as sand