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Big Picture

Big Picture. MS-ESS2-5. Collect data to provide evidence for how the motions and complex interactions of air masses results in changes in weather conditions. Section 1 Characteristics of the Atmosphere. Chapter I1. Bellringer.

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Big Picture

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  1. Big Picture • MS-ESS2-5. Collect data to provide evidence for how the motions and complex interactions of air masses results in changes in weather conditions.

  2. Section1 Characteristics of the Atmosphere Chapter I1 Bellringer • List the ways that the atmosphere is different from outer space. • Write your list in your science journal.

  3. Section1 Characteristics of the Atmosphere Chapter I1 Objectives • Describe the composition of Earth’s atmosphere. • Explain why air pressure changes with altitude. • Explain how air temperature changes with atmospheric composition. • Describe the layers of the atmosphere.

  4. Agenda • Today we will: • Day 1: Do now • Teacher power point with notes. • Exit ticket • Day 2: • Station activities • Exit ticket.

  5. Vocabulary • Atmosphere • Air pressure • troposphere • stratosphere • mesosphere • thermosphere • ionosphere

  6. Section1 Characteristics of the Atmosphere Chapter I1 The Composition of the Atmosphere • The atmosphere is made up mostly of nitrogen gas. Oxygen makes up a little more than 20% of the atmosphere.

  7. Section1 Characteristics of the Atmosphere Chapter I1 Atmospheric Pressure and Temperature • The atmosphere is held around the Earth by gravity. Gravity pulls gas molecules in the atmosphere toward the Earth’s surface, causing air pressure. • As altitude increases, air pressure decreases. • Air temperature decreases as altitude increases. Lower parts of the atmosphere are warmer because they contain a high percentage of gases that absorb solar energy.

  8. Section1 Characteristics of the Atmosphere Chapter I1 Layers of the Atmosphere • The Troposphere: The Layer in Which We Live The lowest layer of the atmosphere, which lies next to the Earth’s surface, is called the troposphere. • The Stratosphere: Home of the Ozone LayerThe atmospheric layer above the troposphere is called the stratosphere. • The Mesosphere: The Middle Layer The mesosphere is the middle layer of the atmosphere. It is also the coldest layer.

  9. Section1 Characteristics of the Atmosphere Chapter I1 Layers of the Atmosphere, continued • The Thermosphere: The Edge of the Atmosphere The uppermost atmospheric layer is called the thermosphere. • The Ionosphere: Home of the AurorasIn the upper mesosphere and the lower thermosphere, nitrogen and oxygen atoms absorb harmful solar energy. This area is called the ionosphere.

  10. Section1 Characteristics of the Atmosphere Chapter I1

  11. Exit Ticket • What are the layers of the atmosphere in order from closest to Earth’s surface to space?

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