Vocab extension 28.2

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Across
  1. 2. All the water on Earth including the water in the atmosphere.
  2. 3. A planetwide system of cliffs on Mercury.
  3. 6. The four inner planets.
Down
  1. 1. Greenhouse gases in the atmosphere trap infrared radiation and keep the planet much warmer than it would be if it had no atmosphere.
  2. 4. The amount of sunlight that reflects from the surface.
  3. 5. The largest volcano on Mars.