Grigglejack puzzle

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Across
  1. 3. The force that pulls objects toward the Earth.
  2. 7. A 3D shape with 6 square faces and 8 corners
  3. 8. the biggest country
  4. 9. This country built the pyramids.
  5. 10. The name of the pig in Charlottes Web
Down
  1. 1. The animal Patrick in Spongebob is
  2. 2. What kind of room has no doors or windows
  3. 4. The letters A, E, I, O, U
  4. 5. The biggest planet
  5. 6. The longest river in the world