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If all the world's water were a sphere, it'd be about as wide as Alaska
Next to it, a much smaller sphere shows the world's liquid fresh water. This image shows blue spheres representing relative amounts of Earth's water in comparison to the size of the Earth.
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Water found outside the Earth: It was created right at the beginning of time
Scientists reveal water formed soon after the first supernova explosions, suggesting life-friendly conditions existed earlier ...
'Microlightning' in water droplets may have sparked life on Earth
Life may not have begun with a dramatic lightning strike into the ocean but from many smaller "microlightning" exchanges ...