RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY RUSSELL KIGHTLEY / SCIENCE PHOTO LIBRARY
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Water molecule, computer artwork. Molecular model of a water molecule (H2O). Two hydrogen atoms (green) are attached to an oxygen atom (red). The molecule is surrounded by van der Waals radii (blue). Water is essential to all life forms on Earth, and covers about 70% of the Earth's surface.
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