Earth Systems

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Across
  1. 2. what is the thinnest layer of the earth
  2. 5. contains all of the planet's solid, liquid, and gaseous water
  3. 7. what isn't an important energy source for earth systems
  4. 8. where is the earth largest at
  5. 9. which nutrient cycle is affected by the burning of trees by factories
  6. 11. variable being tested in scientific experiment
  7. 12. contains all of the cold, hard, solid rock of the planet's crust surface
  8. 13. contains all of the planet's living organisms
Down
  1. 1. contains all of the planet's air.
  2. 3. the variables that the experimenter changes to test their dependent variable
  3. 4. which nutrient cycle involves an animal eating a plant, and excreting the nutrient as waste to be used by plants?
  4. 6. evaporation, condensation, and precipitation are part of
  5. 10. the earth receives most of its external energy from the: