Mars and Venus have a similar structure to Earth whereas Titan doesn't and so they think that because Mars and Venus were made up of mostly CO2 then so was the Earth

Composition of the atmosphere The early atmosphere. Scientists classify the different layers of the atmosphere according to changes in temperature. The Earth's early atmosphere. Scientists believe that the earth's atmosphere has been in existence for over 3.5 billion years. The Earth formed about 4.5 billion years ago. Scientists believe that its early atmosphere. The atmosphere is divided into four layers: the troposphere, stratosphere, mesosphere, and thermosphere. Volcanoes are known to have high concentrations of sulfur, … Scientists believe that the Earth was formed about 4.5 billion years ago.

Scientists believe that Earth's early atmosphere changed in composition as a result of a. the appearance of oxygen-producing organisms b. the drifting of the continents c. the changes in Earth's magnetic field d. a transfer of gases from the Sun
scientists believe that earth's early atmosphere changed in composition as a result of what?

... Usually the change in composition in the atmosphere is a result of increase or decrease in volcanic activity. i'm hoping that's right, yet i think it became the warming of the seas inflicting the launch of great quantities of methane gases stored interior the frozen backside muck which led to a greenhouse impact. Why do scientists think that the Earth's early atmosphere was made up of CO2? was produced by volcanic activity. This is based on the fossil records that are found which date to so many years.

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