The ATMOSPHERE Compare and contrast weather and climate • Weather • Climate Composition of atmosphere • Nitrogen 78% • Oxygen 21% • Carbon dioxide 0.04% to 4% • Water vapor (variable amounts): is the source of all clouds and precipitation. • Ozone: Located in a layer between 10 and 50 kilometers above Earth’s surface. Ozone absorbs potential harmful UV radiation from the Sun. • Air pollutants: salt, dust Height and structure of the atmosphere • The atmosphere thins as you travel away from the Earth. • The higher the altitude the lower the air pressure. Air pressure is highest at sea level. • Diagram of altitude versus air pressure LAYERS of the ATMOSPHERE • The atmosphere is divided into 4 layers based on temperature variation; • Troposphere • Stratosphere • Mesosphere • Thermosphere Diagram of atmosphere layers • Draw graph of layers of atmosphere • In which layer does weather occur? • In which layer is ozone concentrated? Troposphere • Temperature decreases with an increase in altitude. • Weather occurs in this layer. Stratosphere • Ozone is in this layer • Temperature increases as height increases because ozone is absorbing ultraviolet radiation from the Sun. • Exposure to UV causes:- cancer, genetic mutation and sunburn Mesosphere • Does not absorb solar radiation, temperature decrease with increase in altitude. Thermosphere • Temperature increase because oxygen and nitrogen absorb short-wave high- energy solar radiation Answer these questions 1. List the four main layers. 2. List the four minor layers. 3. Which two minor layers are parts of a main layer? 4. Which layer is the most important to you and why? 5. What two layers protect you? 6. Which layer acts like a giant magnet? What does it attract? 7. What does the air in the atmosphere do as it heats up from the Sun? 8. What cloud indicates the top of the troposphere?
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