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4.6 billion years ago was when the Earth was first formed by a mix of hot solids and gasses. While at first the surface of the Earth was molten it started to cool and atmosphere got formed from volcanoes. Unlike now back then the Earths atmosphere consisted of sulfide, methane, and 10 to 200 times as much carbon dioxide compared to today.

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This is period of time is also known as The Archean Eon, a period of time where ethane droplets was in young Earths air. There was no oxygen gas on Earth the only oxygen found would be in compounds like water. Bluish-green tiny organisms named cyanobacteria was in Earth’s oceans. This caused the creation of free oxygen from carbon dioxide water, and sunlight which today is known as photosynthesis. Cyanobacteria created more oxygen which is the amount we have today.

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Earth has evolved, organisms produced enough oxygen to react with the methane which brought a huge change.
photosynthetic bacteria had been making oxygen for about 300 million years which overtime built up oxygen and oxidized with iron enough and soil to make reddish iron oxide and create redbeds.

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Plants became established on land living organisms brought a lot of change on. Oxygen made up 20 percent of the atmosphere 350 million years ago but rose to 35 percent over time. 318 to 299 million years ago forests grew and giant swamps Lots of dead plants became buried under swamps and had no access to oxygen, the level of carbon dioxide dropped which made the Earth cooler

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Earth used to be warmer than it is now Earth’s climate got effected by this. Polar ice caps were barley there or maybe a few, winters were warm. due to the warm climate, plants and animals lived in polar regions. the Eocene Epoch was the warmest part of the time period, palm trees grew, forests covered near the North Pole. The Arctic Ocean wasn't full on frozen, relatives of alligators swam in the swamps and mammals related to lemurs climbed the trees.