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1. Barely any atmosphere
2. Atmosphere created by gases coming from volcanoes
3. Consisted of more carbon dioxide than today's atmosphere, hydrogen, sulfide, and methane
4. For water to be a thing, Earth had to be solidified and cool enough

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4.0 billion years ago to 2.5 billion years ago

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4.0 billion years ago to 2.5 billion years ago

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1. The First organism(Cyanobacteria) to live in earth's ocean
2. The Cyanobacteria contains carbon that instead uses sulfur and other elements for energy
3. The Cyanobacteria created a process known as photosynthesis using water, carbon dioxide and sunlight to make free oxygen

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2.6 billion years ago to 400 million years ago

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2.6 billion years ago to 400 million years ago

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1. Earth's sky turned blue by two photosynthetic organisms releasing enough oxygen to react with methane that cleared up the haze in the sky
2. Iron, earth's soil, and oxygen make up red beds that scientists uses to learn more about earth's past atmosphere
3. Oxygen levels increased
4. Plants and animals evolved

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400 million years ago to 290 million years ago

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400 million years ago to 290 million years ago

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1. 35 percent of oxygen made up the atmosphere
2. Decomposed organisms carbon and oxygen make up carbon dioxide
3. Large forests and swamps make up some of earth's lands
4. Dead organisms that were turned into fossils by heat and pressure are now coal that we use for energy that when burned it releases the carbon dioxide that makes earth warmer

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1. Presently warmer
2. Cold regions around the world were in a warm climate making animals live in cold areas such as the north pole