nature

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Across
  1. 4. Underground plant storage organ, like a potato (5)
  2. 6. Rainforest layer with the tallest trees (9)
  3. 7. The layer of gases surrounding Earth (10)
  4. 10. what is the largest dessert
  5. 11. Process by which plants make food using sunlight (12)
  6. 13. this flower blooms 40-50 days after it is planted
Down
  1. 1. Animal that eats only plants (8)
  2. 2. the most common bird in britain
  3. 3. The gradual wearing down of rocks by wind or water (7)
  4. 5. The tallest type of grass (6)
  5. 8. A habitat where cacti thrive (6)
  6. 9. Birds do this when flying long distances for seasons (9)
  7. 12. Frozen rain that bounces when it hits the ground (4)