The atmosphere is a mixture of gases. The atmosphere is mostly nitrogen (approximately 80%) and oxygen (approximately 20%). The remaining gases are found in much smaller proportions, such as ...

But contrary to popular belief, Earth's atmosphere has no clear or official boundary. Earth's gravity hugs most of the densest gases close to its surface, including oxygen, nitrogen, carbon ...

The Earth’s atmosphere exerts a constant pressure on everything at ... The Earth’s atmosphere, though made up of light gases, ...

The gas methane naturally occurs in the atmosphere in low concentrations. But it’s now considered a greenhouse gas implicated in climate change because of emissions from landfills, large-scale ...

Methane is a more powerful greenhouse gas than carbon dioxide, but there is far less of it in the atmosphere and it does not stay there as long. Methane is more than 25 times as potent as carbon ...