Earth and Universe

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Across
  1. 2. Earth _______________ the Sun in 365 days.
  2. 4. _______________ exists in three forms: solid, liquid, and gas.
  3. 5. _______________ collect dirt from other planets.
  4. 6. Through a telescope, we can see _______________ on the moon.
  5. 8. _______________ makes apples fall to the ground, not fly into the sky.
  6. 9. The _______________ between Earth and the sun is 149.60 million kilometers.
  7. 10. Earth has an inner _______________ and an outer _______________.
Down
  1. 1. You can measure the _______________ of a circle by drawing a straight line through its center.
  2. 3. Apollo 13 is a famous _______________.
  3. 7. 71% of Earth’s _______________ is water.