EARTH SUBSYSTEM

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Across
  1. 6. full of ions that helps the radiowave travel faster
  2. 7. the thinnest subsystem of the Earth
Down
  1. 1. the liquid part of the Earth
  2. 2. sculpts the surface of the Earth
  3. 3. burns down the space rocks entering the Earth's surface
  4. 4. generate the magnetic field of the Earth
  5. 5. when matter cannot go in and out but energy can