Atmosphere - A blanket of gases that surrounds Earth and is held in place by gravity., Nitrogen - The most abundant gas in the atmosphere, making up about 78%, and essential for the nitrogen cycle., Oxygen - A gas that makes up about 21% of the atmosphere and is needed for breathing and survival of living things., Carbon Dioxide - A trace gas in the atmosphere that helps regulate temperature and is necessary for photosynthesis., Water Vapor - Water in its gaseous state, important for weather, climate, and the water cycle., Air Pressure - The force caused by the weight of air molecules pressing down on Earth’s surface., Troposphere - The lowest atmospheric layer, containing most of the gases and all weather phenomena., Stratosphere - The second layer of the atmosphere, containing the ozone layer that absorbs harmful UV radiation., Mesosphere - The third layer of the atmosphere, where meteors burn up and shooting stars appear., Kármán Line - The boundary about 100 kilometers above Earth’s surface that scientists consider the start of outer space.,

Atmosphere

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