Science Nerd Words

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Across
  1. 1. Cycle `All living things are made of this and it's a cycle.
  2. 4. The warmest layer of the atmosphere.
  3. 6. The most common gas in the atmosphere.
Down
  1. 2. Covers and protects the Earth.
  2. 3. Cycle Moves water around the Earth.
  3. 4. The bottom atmospheric layer.
  4. 5. Water that does not not soak into the ground, but runs into bodies of water.