![]() ![]() The stratosphere is the next layer up from Earth’s surface. Temperatures in the troposphere decrease with altitude. Most of the water vapor in the atmosphere, along with dust and ash particles, are found in the troposphere-explaining why most of Earth’s clouds are located in this layer. The majority of the mass of the entire atmosphere is contained in the troposphere-between approximately 75 and 80 percent. ![]() The troposphere is thickest at the equator, and much thinner at the North and South Poles. The layer closest to Earth’s surface is the troposphere, reaching from about seven and 15 kilometers (five to 10 miles) from the surface. The atmosphere is divided into five different layers, based on temperature. Trace amounts of carbon dioxide, methane, water vapor, and neon are some of the other gases that make up the remaining 0.1 percent. Earth’s atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases. While oxygen is necessary for most life on Earth, the majority of Earth’s atmosphere is not oxygen. Not all scientists agree where the actual upper boundary of the atmosphere is, but they can agree that the bulk of the atmosphere is located close to Earth’s surface-up to a distance of around eight to 15 kilometers (five to nine miles). After that, the atmosphere blends into space. The clouds you see in the sky, the wind that is moving the trees or the flag in your school yard, even the sunshine you feel on your face-these are all a result of Earth’s atmosphere.Įarth’s atmosphere stretches from the surface of the planet up to as far as 10,000 kilometers (6,214 miles) above.
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