No Planet B

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Across
  1. 3. process which plants convert light energy into chemical energy
  2. 6. loose sand, clay, silt, and other soil particles that settle at the bottom of a body of water
  3. 7. layers of gases retained by Earth's gravity
  4. 8. chemical substance with symbol C and atomic number 6
Down
  1. 1. transmission of energy in the form of waves
  2. 2. fuel formed from natural processes
  3. 4. process which dead organisms are broken down
  4. 5. solid, outer part of the Earth