Earth's atmosphere (article) | Khan Academy
https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:earth-systems-and-resources/x0b0e430a38ebd23f:earths-air-and-water/a/earth-s-atmosphere
•Earth is surrounded by a mixture of gases called the atmosphere. The composition of the atmo…•Earth’s atmosphere consists of five distinct layers that are distinguished by temperature gradients—the layers alternate between having temperatures that increase or decrease with altitude. The five principal layers of the atmosphere are the troposphere, stratosphere, mesosph… •Troposphere: The troposphere is the layer closest to Earth. It is the densest layer (i.e., contain…•Stratosphere: The stratosphere is the layer above the troposphere. It has a concentrated region of ozone gas called the ozone layer, which keeps about 95% of the sun's harmful UV radiation from reaching the Earth’s surface. Ozone molecules absorb UV radiation and release heat, whic…
•Earth is surrounded by a mixture of gases called the atmosphere. The composition of the atmo…•Earth’s atmosphere consists of five distinct layers that are distinguished by temperature gradients—the layers alternate between having temperatures that increase or decrease with altitude. The five principal layers of the atmosphere are the troposphere, stratosphere, mesosph…
•Troposphere: The troposphere is the layer closest to Earth. It is the densest layer (i.e., contain…•Stratosphere: The stratosphere is the layer above the troposphere. It has a concentrated region of ozone gas called the ozone layer, which keeps about 95% of the sun's harmful UV radiation from reaching the Earth’s surface. Ozone molecules absorb UV radiation and release heat, whic…
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