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Warm Up

What is the atmosphere?. Warm Up. Why is the ATMOSPHERE important?. What is it?. What is the atmosphere and how have we discovered more about it? Video Clip. Weather. Weather is the condition of the earth’s atmosphere at a particular time and place So what is the atmosphere?.

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Warm Up

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  1. What is the atmosphere? Warm Up

  2. Why is the ATMOSPHERE important?

  3. What is it? • What is the atmosphere and how have we discovered more about it? • Video Clip

  4. Weather • Weather is the condition of the earth’s atmosphere at a particular time and place • So what is the atmosphere?

  5. Earth’s Atmosphere • A thin layer of gases that surrounds the planet • Makes conditions on earth suitable for living things

  6. Composition • Nitrogen – 78% • Oxygen – 21% • Carbon dioxide • Water vapor • Other gases • Particles of liquids and solids

  7. Nitrogen • Most abundant gas in the atmosphere • 78% of the air we breathe • N2 • Essential to living things – needed to grow and repair body cells • Bacteria convert nitrogen from the air and then plants use it to create proteins that people and animals need.

  8. Oxygen • Second most abundant gas in the air • Only 21% of the volume • Usually in the form of O2 • Plants and animals use it • Important in other processes • Ozone (O3) – forms when lightning interacts with Oxygen

  9. Carbon Dioxide • CO2 • Only in small amounts - .036% • Essential to life – plants need it to make food

  10. Other Gases • Called trace gases because only small amounts are present

  11. Water Vapor • Amount in the air varies from place to place • Plays an important role in the earth’s weather • Clouds, precipitation

  12. Particles • Pure air is only gases, but this exists only in a lab • In the real world, there are many different particles • Dust • Smoke • Salt • Other chemicals

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