The earliest atmosphere was very rich in carbon dioxide (like the present Mars and Venus). The present atmosphere is 80% Nitrogen and 20% Oxygen. Life on Earth was what transformed the content of the Earth's atmosphere to its present composition. Earth's climate has changed dramatically many times since the planet was formed 4.5 billion years ago. These changes have been triggered by the changing configuration of continents and oceans, changes in the Sun's intensity, variations in the orbit of Earth, and volcanic eruptions.
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Answer:
The earliest atmosphere was very rich in carbon dioxide (like the present Mars and Venus). The present atmosphere is 80% Nitrogen and 20% Oxygen. Life on Earth was what transformed the content of the Earth's atmosphere to its present composition. Earth's climate has changed dramatically many times since the planet was formed 4.5 billion years ago. These changes have been triggered by the changing configuration of continents and oceans, changes in the Sun's intensity, variations in the orbit of Earth, and volcanic eruptions.