unit 7 crossword

123456
Across
  1. 2. natural science that examines outer space
  2. 4. a bowl-shaped or hallow area created by meteorite
  3. 5. a process where a species goes extinct
  4. 6. 1st planet from the sun
Down
  1. 1. ...system
  2. 2. a region between Jupiter and Mars where are a lot of asteroids and minor planets
  3. 3. object in space that is smaller than planets and orbit the sun
  4. 4. biggest asteroid in our solar system