Planets, Moon, and Age of the Earth

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Across
  1. 3. over time dead organisms break down and releases particles and energy in this process
  2. 5. raised areas in white on the surface of the moon
  3. 6. planet with a surface covered with rust
  4. 8. these particles are used by geologists to determine the absolute ages of rocks
  5. 9. the closest planet to the sun
  6. 10. a rock that exists in many places but for a short period of time which this is useful because if the scientists know the age of this rock, they can determine the age of other rocks around it
  7. 11. when magma pushes its way up through the rocks and hardens before it reaches the surface
  8. 14. the farthest planet from the Sun
  9. 15. the planet on which we live
  10. 16. scientists that study rocks and the materials of the Earth
  11. 20. the number of years since the rock formed
  12. 21. large dark patches on the surface of the Moon
  13. 23. approximately the time it takes for the Earth to make one revolution around the Sun
Down
  1. 1. this law explains that the deeper down you go, the older the rocks are
  2. 2. the age of the rock compared to the age of other rocks around it bu doesn't say exactly how old you are
  3. 3. to spin around on its axis
  4. 4. approximately the time it takes for the moon to make one revolution around the Earth
  5. 7. holes or dents on the surface of the moon
  6. 12. the largest planet in the solar system
  7. 13. to make a circle around something else
  8. 16. the last 4 planets are known as this
  9. 17. the planet known for its large ring
  10. 18. the time it takes for half of the rock's particles to decay
  11. 19. the planet that is covered with acid
  12. 22. the planet that spins side-ways