MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Volcanic sand. 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. This is black volcanic sand formed from the erosion of cooled lava. This sand is from the Anse Couleuvre Beach, Martinique, the Caribbean.
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