Have your science book open to page 74 so I may check your reading homework Thursday 2/23/17 Notebook Entry: A system is something with parts that work together. The atmosphere is a system. What do you thinks its parts are that work together?

BIG Question: How does the sun’s energy affect Earth’s atmosphere? The Atmosphere BIG Question: How does the sun’s energy affect Earth’s atmosphere?

How long will the candle burn? (big jar vs. little jar) Prediction: What is your prediction? Why do you think that? Observation 3. What do you think might happen if I put a bigger candle under the jar? Container Size Time (sec) Jar Large (437 ml) Jar Small (237 ml)

Nitrogen (N2) Importance: adds mass to the atmosphere creating air pressure nitrogen is usually volatile when in liquid or solid form – will turn to a gas easily it is unreactive with materials that make up the solid earth  it is very stable in the presence of solar radiation.

Oxygen (O2) Importance: needed by plants and animals, necessary for fire to burn What if there was too much? toxic to animals What if there was too little? earth could not support life

Water Vapor (H2O) Importance: important factor in weather, part of water cycle What if there was too much?- Earth would get too hot What if there was too little? – Earth would be too cold

Carbon Dioxide (CO2) Importance: needed by plants, keeps Earth warm enough to live on What if there was too much?- Earth would be too hot What if there was too little? – plants would not survive, earth would be too cold

Ozone (O3) Importance: blocks harmful UV light from the sun, What if there was too much? harms plants and animals What if there was too little? UV light would not be blocked

Atmosphere as seen from International Space Station

Humans in the Atmosphere