What process caused the accumulation of sand that produce the sand dunes? A. deposition

B. physical weathering

C.

chemical weathering

D.

erosion

Anwser A

Explanation:

Sand dunes are created by wind deposition.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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