Study of Earth crossword puzzle

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Across
  1. 2. A greenhouse gas produced by burning fossil fuels
  2. 3. Overtime this will happen to ancient organisms replacing them with an exact replica of the organism transforming it into a fossil
  3. 6. The study of all living things
  4. 8. The _____ are built around Earths mantle/core
  5. 10. A greenhouse gas commonly produced by large groups of cattle
Down
  1. 1. Particles from rock erosion and weathering
  2. 4. A protective shell that surrounds Earth
  3. 5. The greenhouse gases in Earths atmosphere are Carbon Dioxide, Methane and _______
  4. 7. Scientists study this frozen time capsules to get a better understanding of past atmospheric conditions and climate
  5. 9. The carbon cycle always cycles back to _______