Math & Science & Nature

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Across
  1. 2. The planet to which we live on.
  2. 3. the introduction of harmful materials into the environment.
  3. 4. An area of knowledge that includes such topics as numbers, formulas and related structures.
  4. 7. a community of people formed on the basis of a combination of shared features such as language, history, ethnicity, culture and/or society.
  5. 8. all the inhabitants of a particular place.
  6. 10. The process of converting waste materials into new materials and objects.
  7. 11. Grow or cause to grow and become more mature, advanced, or elaborate.
Down
  1. 1. a barren area of landscape where little precipitation occurs and, consequently, living conditions are hostile for plant and animal life.
  2. 2. The surroundings or conditions in which a person, animal, or plant lives or operates.
  3. 5. a piece of land surrounded by water.
  4. 6. an area of land dominated by trees.
  5. 9. the body of salt water that covers approximately 70.8% of the surface of Earth and contains 97% of Earth's water.