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Earth’s atmosphere Objectives TSWBAT: List the layers of the atmosphere Describe the characteristics of the layers of atmosphere using chart in ESRT Describe what the atmosphere is composed of What is the atmosphere? Thin envelope of gas that surrounds the Earth. Extends 375 miles above sea level What are the elements in the atmosphere? (pg 1) Nitrogen , oxygen, argon, neon, helium, hydrogen and xenon What did the atmosphere use to be like 2 billion years ago? No oxygen, contained water vapor and carbon dioxide Photosynthesis produced oxygen Carbon dioxide = rocks, water vapor = oceans/lakes What are other things that are in the atmosphere? Oxygen, Nitrogen, other Water vapor, carbon dioxide, methane, ozone, nitrous oxide, and CFC’s. (Varies) Atmospheric Structure Layer Altitude Temperature Pressure Water Vapor inversion inversion What is the ozone layer? Ozone – unstable molecule composed of three atoms of oxygen that help block Ultraviolet radiation from the sun. 15 miles above Earth (stratosphere) Where does all weather take place? Troposphere (only layer with water vapor) – contains 90% of gases What is an interface? Between each layer of the atmosphere is an interface (boundary between 2 regions that change properties) These interfaces are the tropopause, stratopause and Mesopause For example, the top of the troposphere is the “tropopause.” Isothermal Layer A layer in the atmosphere where temperature remains the same as altitude increases (tropopause)