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The Atmosphere

The Atmosphere. What is the atmosphere?. The layer of gases that surrounds our planet. Weather is the condition of the atmosphere at a certain place and time. Our atmosphere makes life possible on our planet. Provides us with oxygen. Keeps surface warm so water can exist as a liquid.

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The Atmosphere

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  1. The Atmosphere

  2. What is the atmosphere? • The layer of gases that surrounds our planet. • Weather is the condition of the atmosphere at a certain place and time. • Our atmosphere makes life possible on our planet. • Provides us with oxygen. • Keeps surface warm so water can exist as a liquid. • Protects the surface from dangerous radiation from the sun.

  3. Composition of the Atmosphere • Nitrogen makes up 80% of our atmosphere • Oxygen makes up 21% • Argon makes up almost 1% • All other gases have only trace amounts

  4. Nitrogen • Most abundant element in atmosphere (78%) • Always occurs as N2 • Gas at room temperature • Un-reactive, somewhat inert, does not easily combine with other elements • Vital to life

  5. Oxygen • 2nd most abundant element in atmosphere (21%) • Found in nature as O2 • Very reactive, supports combustion • Very vital to most living things

  6. Argon • 3rd most abundant element on atmosphere (0.93%) • Completely inert, does not combine with other elements • Used in neon lights

  7. Trace elements/compounds • Carbon dioxide: plants use to produce food. Plants take in CO2 and give off oxygen as a waste product. • Animals take in oxygen to make energy and give off CO2 as a waste product. • Fossil fuels (coal, oil, natural gas) give off CO2 when they are burned. Rising CO2 levels can cause global warming.

  8. Water Vapor • Water Vapor is water in the form of a gas. • It is invisible, not the same thing as steam. Steam is water vapor condensing back into a liquid. • The amount of water vapor in the air varies, from 0% in an arid environment, to 5% in tropical rain forests.

  9. Ozone • Ozone is a molecule of oxygen with 3 oxygen atoms instead of 2. • Often formed when lightning interacts with oxygen in the air. • Forms a layer in the atmosphere that absorbs ultraviolet radiation from the sun. Without this layer life might not be possible on the surface of the planet.

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