study

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Across
  1. 3. people’s
  2. 4. generate
  3. 5. of energy
  4. 8. power to
  5. 10. as weathering, erosion, or plate tectonics
  6. 11. The sum of all
  7. 13. of time
  8. 15. then the organisms that need it cannot
  9. 16. soil and rock layers
  10. 18. Resources Resources that exist in the environment without
  11. 19. Replaceable by natural means in a short period of
  12. 20. can be used
  13. 21. Resource Something that is needed by organisms and is not
Down
  1. 1. Resource A source or
  2. 2. a layer of gas surrounding a planet
  3. 6. matter on
  4. 7. Process Any natural process that happens to Earth’s surface,
  5. 9. Water that collects in cracks and pores in
  6. 12. Not replaceable by natural means within a short
  7. 14. in its abundance in the environment; if it is
  8. 17. intervention