Inner Planets 7th grade Science

123456789
Across
  1. 2. a probe sent to Venus
  2. 4. Earth's sister planet
  3. 5. small planets that have rocky surfaces
  4. 7. rotates from east to west
  5. 8. closest planet to the sun
  6. 9. 70% surface is covered by water
Down
  1. 1. trapping of heat by the atmosphere
  2. 3. terra or "Earth"
  3. 6. microwave-sized remote-control rover
  4. 8. the "red planet"