space and hydro

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Across
  1. 3. The solid, outermost layer of a planet.
  2. 5. The water on, above, and below a planet's surface.
  3. 10. The layer of gases that surrounds a planet.
  4. 12. The path that an object takes around another object in space.
  5. 15. A model of the universe that places Earth at the center.
  6. 16. The process by which water evaporates from plants.
  7. 18. The process by which water changes from a gas to a liquid.
  8. 20. An object in space created when a massive star implodes, whose gravity is so strong not even light can escape.
  9. 21. The practice of using treated wastewater for other purposes, such as irrigation.
  10. 22. The water on, above, and below Earth's surface.
  11. 23. A model of the universe that places the sun at the center.
  12. 24. The process by which water falls from the atmosphere to Earth's surface.
  13. 25. All of space and everything in it.
  14. 28. The process of removing impurities from water.
Down
  1. 1. An orbit system with smaller circles inside of a larger one.
  2. 2. The part of a planet that is inhabited by living things.
  3. 4. The system that delivers water to people and businesses.
  4. 6. The process by which water changes from a liquid to a gas.
  5. 7. The region of space around a planet that is affected by its magnetic field.
  6. 8. The planning and control of water resources.
  7. 9. A large star and all the objects that orbit it, including planets, moons, asteroids, comets, and dust.
  8. 11. A period of time when there is not enough rain or snow.
  9. 13. The movement of an object around another object in space.
  10. 14. The process by which water soaks into the ground.
  11. 17. A large collection of stars, gas, and dust held together by gravity.
  12. 19. A natural disaster that occurs when water overflows its banks.
  13. 26. The spinning motion of an object around its own axis.
  14. 27. The water that flows over the land after precipitation.