glass and nature

Although most people think of glass as a man-made material, it is found in many forms in the natural world. Volcanoes spew molten rock, lightning strikes desert and beach sands, meteorites pound the earth, and sea sponges and microscopic organisms inhabit the waters. All of these things—and even lunar soils—are materially related to the man-made glass that we use every day. see more about glass in nature