Planet Earth

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Across
  1. 5. To travel around the Sun.
  2. 6. The name of each half of a planet.
  3. 7. The gas which is essential to life on Earth.
  4. 9. An imaginary line that runs through Earth’s center from the North Pole to the South Pole.
  5. 10. The rocky outer layer of the Earth.
Down
  1. 1. The layer which is the centre of the planet.
  2. 2. The layer of gases surrounding Earth.
  3. 3. The coour of the Earth seen from outer space.
  4. 4. The rotation of the Earth around its axis.
  5. 8. The force that keeps Earth orbiting the Sun.