Chapter 6. The Earth. Our Earth is a very special place. Seeds Of Life. Liquid Water. Not too hot, not too cold!. The Earth’s atmosphere has evolved over billions of years. First atmosphere: hydrogen and helium Second atmosphere: 98% carbon dioxide
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2% water, ammonia, methane, and nitrogen
Aurorae charged particles from the Sun called the solar wind
Collision rich core
of two plates
Earth’s surface is composed of about 12 major plates which slowly move relative to one another
Plate tectonics produced major changes to the Earth’s surface over the past 200 million years