UNIT THREE: Matter, Energy, and Earth. Chapter 8 Matter and Temperature Chapter 9 Heat Chapter 10 Properties of Matter Chapter 11 Earth’s Atmosphere and Weather. Chapter Eleven: Earth’s Atmosphere and Weather. 11.1 Earth’s Atmosphere 11.2 Weather Variables
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Nitrogen gas makes up about 78 percent of Earth’s atmosphere.
The second most abundant gas is oxygen, which makes up 21 percent of Earth’s atmosphere.11.1 What's in Earth's atmosphere?
Photosynthesis changed Earth’s atmosphere.
Long ago, mercury barometers were used.11.1 Measuring Pressure