Geologic Time and Earth, Sun, Moon System

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Across
  1. 3. The imaginary line around which a planet rotates.
  2. 4. A major division of geologic time, made up of periods.
  3. 6. The most recent era, known as the Age of Mammals.
  4. 7. Preserved remains or traces of ancient organisms.
  5. 10. A unit of geologic time smaller than an era but larger than an epoch.
  6. 11. The force that pulls objects toward each other.
  7. 14. A division of geologic time smaller than a period.
  8. 15. The permanent disappearance of a species from Earth.
  9. 16. The longest span of geologic time, before most life forms evolved.
  10. 17. The phase when the Moon appears to be growing larger.
Down
  1. 1. The era known as the Age of Reptiles, including dinosaurs.
  2. 2. eclipse When Earth’s shadow falls on the Moon, blocking sunlight.
  3. 4. The longest unit of geologic time, divided into eras.
  4. 5. The rise and fall of ocean levels due to the Moon’s gravity.
  5. 8. The path an object takes as it moves around another object.
  6. 9. eclipse When the Moon blocks sunlight from reaching Earth.
  7. 10. An era when early life forms like fish and amphibians appeared.
  8. 12. The spinning of an object on its axis, like Earth’s daily spin.
  9. 13. The movement of one object around another, like Earth around the Sun.
  10. 15. When one celestial body blocks light from reaching another.