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Earth’s atmosphere supports life. The Sun supplies the atmosphere’s energy.

Earth’s atmosphere supports life. The Sun supplies the atmosphere’s energy. The atmosphere makes life on E Earth possible. The atmosphere is a whole layer of air that surrounds Earth. It supports and protects life.

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Earth’s atmosphere supports life. The Sun supplies the atmosphere’s energy.

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  1. Earth’s atmosphere supports life.The Sun supplies the atmosphere’s energy.

  2. The atmosphere makes life on E Earth possible. • The atmosphere is a whole layer of air that surrounds Earth. It supports and protects life. • The gases keep Earth warm and transport energy across the planet. • If we did not have an atmosphere, Earth would be a cold, lifeless rock. • The atmosphere is very thin but very important. • There is no definite end of the atmosphere, it just keeps getting thinner and thinner.

  3. Materials in the Atmosphere • Most of the materials in the atmosphere are gases but there are also solid and liquid materials such as dust, sea salt, and water droplets. • The atmosphere mainly contains gasses such as nitrogen, oxygen, and carbon dioxide. • These gases provide materials essential for living things. • Nitrogen: promotes plant growth • Oxygen: necessary for plants and animals • Carbon dioxide: plants use this to make food

  4. Natural processes modify the atmosphere. • The exact amounts of gases in the air can depend on location, time of day, season, ongoing processes, and sudden changes. • Ongoing processes: you breathe in about 3,000 gallons of air a day. When you breath your body exchanges gases with the atmosphere. The air you breath is a slightly different mixture than the air you exhale. • We breathe in air which is a mix of oxygen, nitrogen, and carbon dioxide. We exhale is richer in carbon dioxide and has less oxygen. • Living things take part in a repeated process of gas exchange with the atmosphere. • Cycles: processes like these that repeat over and over.

  5. The Carbon Cycle • Carbon dioxide and Oxygen • Constantly cycle among plants, animals, and the atmosphere • Animals inhale air, use some oxygen, exhale air that has less oxygen and more carbon dioxide • Plants take in carbon dioxide and release oxygen

  6. The 4 Major Layers of the Atmosphere… Troposphere • Nearest Earth’s surface • Weather takes place here! • WE LIVE IN THE TROPOSPHERE! Stratosphere • Clear, dry layer • Ozone layer – absorbs radiation that is harmful to life Mesosphere • Very thin air • Less that 0.1% of the mass of the atmosphere Thermosphere • Less and less dense until it becomes outer space The Minor Layers include… Ozonosphere Ionosphere Exosphere Magnetosphere

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