The sand grains that make up beaches originated mainly from
A)windblown materials from desert environments.
B)the great rivers of the world.
C)melting icebergs.
D)coastal erosion and streams.

Question

Quizplus · Accepted Answer

The sand grains that make up beaches mainly originate from coastal erosion and streams. As water flows through streams, it transports rock fragments and minerals which eventually end up as sand on the beach. The constant pounding of waves on the coastline also causes erosion, resulting in the wearing down of rocks and cliffs, and contributing to the sand on the beach. While windblown materials from desert environments and melting icebergs can also contribute to beach sand, they make up a relatively small portion of it compared to coastal erosion and streams. The great rivers of the world also transport sediment to the coast, but the majority of the sediment is deposited in deltas rather than on the beach.

The Sand Grains That Make Up Beaches Originated Mainly from