Sand is often produced by four processes: weathering of continental granitic rock, weathering of oceanic volcanic rock, precipitation from water, and skeletal remains of creatures.
Sand is typically obtained from rocks on land. Rock is cracked into smaller pieces over time by weather conditions such as rain, ice, wind, heat, cold, and even plants and animals. Large boulders that split into smaller rocks could be the starting point of this weathering. The granite is eroded by water that enters fissures.
Sand arises from volcanic rock in regions where there are volcanoes. This explains why the Hawaiian Islands' beaches are different colors.
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