ecology

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Across
  1. 3. Earth’s solid layer of rock, soil, and sediment.
  2. 4. A place that stores more carbon than it releases.
  3. 6. Process where organisms release CO₂ by breaking down food.
Down
  1. 1. Process plants use to turn CO₂ into glucose.
  2. 2. The element that cycles through Earth’s systems
  3. 5. Energy-rich material formed from ancient remains.