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The Chemistry of Earth’s Atmosphere

The Chemistry of Earth’s Atmosphere. TCAP Review Lesson 18 Voc. Foldable X. Atmosphere. The mixture of gases that surround Earth. Cyanobacteria. Single-celled organisms. Photosynthesis.

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The Chemistry of Earth’s Atmosphere

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  1. The Chemistry of Earth’s Atmosphere TCAP Review Lesson 18 Voc. Foldable X

  2. Atmosphere • The mixture of gases that surround Earth

  3. Cyanobacteria • Single-celled organisms

  4. Photosynthesis • The process by which plants, algae, cyanobacteria, and some other bacteria use energy from sunlight to make food.

  5. Chemistry of Earth’s Atmosphere Notes page 23 Earth’s Early Atmosphere • Scientists are not sure how Earth’s atmosphere formed • Scientists agree that many of the gases in Earth’s early atmosphere came from inside Earth • Volcanoes released gases into the space above Earth’s surface • These gases included water vapor, hydrogen, nitrogen, carbon dioxide, methane and carbon monoxide

  6. Cyanobacteria • Single-celled organisms that can make food by photosynthesis • Evidence in rocks indicates that the first living things appeared in Earth’s oceans about 3.5 billion years ago • Make food by photosynthesis

  7. Photosynthesis • The process by which plants, algae, cyanobacteria and some other bacteria use energy from sunlight to make food • During photosynthesis, organisms combine water and carbon dioxide to form sugar and oxygen • Oxygen is released into the atmosphere (product)

  8. Composition of Earth’s Atmosphere • Nitrogen -78% • Oxygen – 21% • Argon - .94% • Carbon Dioxide – 0.03 % • Neon – 0.001% • Helium – 0.0005% • Methane – 0.00015% • Water Vapor (average)- Up to 1%

  9. The amount of carbon dioxide (CO2) in the air is increasing • Burning of fossil fuels (oil, coal, and natural gas) over the past century has released large amounts of carbon dioxide into the atmosphere • Deforestation has resulted in fewer trees left to use up CO2

  10. Chemistry of Earth’s Atmosphere HW pg. 22 • Which is the most abundant gas in Earth’s present atmosphere? • Oxygen • Water vapor • Nitrogen • Argon

  11. Chemistry of Earth’s Atmosphere HW pg. 22 2. Scientists think that the gases that formed Earth’s early atmosphere came mostly a. from outer space b. from inside Earth c. from the oceans d. from plants

  12. Chemistry of Earth’s Atmosphere HW pg. 22 3. Which is a product of photosynthesis? a. oxygen b. carbon dioxide c. water d. cyanobacteria

  13. Chemistry of Earth’s Atmosphere HW pg. 22 4. Which may be partly responsible for increased amounts of carbon dioxide in Earth’s atmosphere? a. the burning or fossil fuels b. an increase in organisms that use photosynthesis to make their own food c. rising temperatures d. increased farming

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