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Across
  1. 1. Solid materials that make up the Earth's crust
  2. 4. Living beings that can move and respond to stimuli
  3. 6. Large areas covered with trees and diverse plant and animal life
  4. 8. The invisible gaseous substance surrounding the Earth
  5. 11. Light and heat from the sun
  6. 13. The upper layer of Earth's surface, containing nutrients for plants
  7. 15. Tall plants with a trunk and branches, providing shade and oxygen
  8. 16. Naturally occurring substances with specific chemical compositions
  9. 18. Any substance consumed to provide nutritional support
  10. 19. gas A flammable gas extracted from underground deposits
  11. 20. Air in motion, often harnessed for generating electricity
Down
  1. 2. energy Energy derived from the sun's radiation
  2. 3. A transparent liquid that is essential for life
  3. 5. sources Places where water can be found, such as rivers, lakes, and oceans
  4. 7. Vast bodies of saltwater that cover a significant portion of the Earth
  5. 9. Living organisms that typically have leaves and use photosynthesis
  6. 10. fuels Energy resources formed from the remains of ancient plants and animals
  7. 12. Naturally occurring substances with specific chemical compositions
  8. 14. A thick, flammable liquid used as fuel and in the production of goods
  9. 17. energy Energy generated from sources that can be naturally replenished