GARY HINCKS / SCIENCE PHOTO LIBRARY GARY HINCKS / SCIENCE PHOTO LIBRARY
Structure of water, molecular model. In these molecules of water (H2O), the atoms are represented as spheres and are colour-coded: hydrogen (white) and oxygen (red). The molecules are linked by hydrogen bonds (dotted lines). Water is essential to all life forms on Earth and covers about 70 percent of the Earth's surface.
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