MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Coastal sand, close-up. Sand is composed of small grains of rock. Its composition and grain size varies depending on the location, the rocks involved and the erosion and weathering forces that formed the sand. Shells are seen here, and along with corals can contribute to the composition of coastal sands. This sand is from the North Sea coast of Germany.
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