Activity in People and Earth

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Across
  1. 3. the natural flooding and over-irrigation that brings water at underground levels of the surface
  2. 7. typically an inorganic substance that has a specific chemical composition and crystal structure
  3. 8. a great consumer of land and energy
  4. 11. the extraction of minerals and metals from earth
  5. 13. a very large land community unit where the plant species are more or less uniform
  6. 15. minerals containing one or more metals
  7. 17. includes all the physical and biological surroundings and their interactions
  8. 19. economic activity concerned with the processing of raw materials and manufacture of goods in factories
  9. 20. the action of clearing a wide area of trees
Down
  1. 1. result of deforestation
  2. 2. a combination of fire and grazing animals are important to maintain this
  3. 4. flat and cold with low plants like grass and moss that only grow during the short summer
  4. 5. it is when the environment becomes enriched with nutrients
  5. 6. group of trees and shrubs that live in the coastal intertidal zone
  6. 9. art and science of cultivating the soil, growing crops and raising livestock
  7. 10. means house
  8. 12. sometimes called plains or prairie
  9. 14. makes up the hottest biome
  10. 16. a bilogical community of interacting organisms and their physical environment
  11. 18. components of these are living factors of an ecosystem