Science!

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Across
  1. 1. The natural satellite of the earth
  2. 4. The smallest unit of life
  3. 5. The natural phenomenon that causes lightning and thunder
  4. 6. The state of matter that has no fixed shape or volume
  5. 7. The substance that covers about 71% of the earth’s surface
  6. 9. The process by which plants make their own food
  7. 11. The change of state from liquid to gas
Down
  1. 1. The name of our galaxy
  2. 2. The organ that pumps blood throughout the body
  3. 3. The measure of the amount of matter in an object
  4. 6. The force that attracts a body toward the center of the earth
  5. 8. The branch of science that studies living organisms
  6. 10. The unit of force in the SI system