FRANCOISE SAUZE / SCIENCE PHOTO LIBRARY FRANCOISE SAUZE / SCIENCE PHOTO LIBRARY
Water molecules. Computer illustration of water molecules spinning into a whirlpool of atoms. The molecules' atoms are shown as balls and sticks and are colour-coded: oxygen (red) and hydrogen (white). Water molecules (H2. O) have a bond angle of just under 110 degrees between their hydrogen atoms. Water is essential to all life forms on Earth, and covers about 70% of our planet's surface as the oceans and seas.
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