How fragile we are

How fragile we are

Our planet’s original atmosphere (Hydrogen and Helium) disappeared as the Earth’s gravity wasn’t strong enough to hold onto it. However, the internal heat of the planet, created volcanoes that poured out, Nitrogen and Carbon Dioxide gas. Unlike the other planets in our solar system, we were at just the right distance from the Sun for liquid water to remain on the surface. The rain washing out some of the carbon from the atmosphere (Venus wasn’t so fortunate), and the surface water providing an environment for life to grow (a period that wouldn’t have lasted very long on Mars). Life breathed in the Carbon Dioxide, exhaling Oxygen back into the atmosphere. That same Oxygen that in time would allow creatures like us to evolve, living under the protection of the thin layer of our atmosphere.

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~ by jamesdow2013 on April 19, 2013.

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