3.2

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Across
  1. 1. refers to the destruction of habitats, which usually results from human activities
  2. 2. is the use or extraction of a resource until it is depleted
  3. 3. can occur when water and wind erosion removes topsoil from bare land
  4. 5. is the practice in which forests are logged or cleared for human use and never replanted
  5. 7. refers to the ways we obtain and use these materials
  6. 8. is one method that reduces run-off by improving the movement of air and water through soil
  7. 9. occurs when soil particles are squeezed together and the air spaces between the particles are reduced
  8. 11. is the introduction of chemicals, toxins, wastes, or micro-organisms into the environment in concentrations that are harmful to living things
Down
  1. 1. is the division of habitats into smaller, isolated fragments
  2. 4. refers to the ways we use the land around us for urban development, agriculture, industry, mining,and forestry
  3. 6. These processes are important to biological diversity and ensure the continuation of the ecosystem over time
  4. 10. is the dying out of a species