Exploratour - Evolution of the Solar System
This is an image of Mt. St. Helens, in Washington, USA.
Click on image for full size
Image from: USGS, courtesy of Volcano World
Click on image for full size
Image from: USGS, courtesy of Volcano World
Scientists think that the secondary atmosphere came from the many volcanic eruptions which took place in Earth's early history, and which continue today. The formation of the early ocean was also important to the forming of the secondary atmosphere.
We will talk more about the changes in Earth's atmosphere later.
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