ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Water. Molecular model of water. The red sphere represents an oxygen atom and the white spheres represent hydrogen atoms. The bond angle between the hydrogen atoms is about 110 degrees, but the exact angle depends upon the physical state of the water. Water is essential to all life forms on Earth, and covers about 70% of the Earth's surface.
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