Water: A Basic Building Block of Life

It surrounds us by comprising more than 2/3 of the Earth's surface area. 70% of our body weight is from water. The simplicity of its easily recognized symbol H2O, signifying its composition of two hydrogen and one oxygen atom, understates its fundamental importance to all life on our planet. Yet it is believed that much of Earth's water had extraterrestrial origins; having traveled here by way of comets and other celestial bodies. Regardless of its source our planet would be barren without it. Being a basic building block of life, water is second only to our air in sustaining all living things, both animal and vegetable.

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