Geologic Time Scale

1234567891011
Across
  1. 5. a large division of geologic time
  2. 7. comparing the age of rock layers
  3. 8. a radioactive form of the element carbon
  4. 9. fossils used to compare the ages of rocks
  5. 11. magma being pushed into cracks within Earth
Down
  1. 1. when ice sheets cover large areas of land
  2. 2. the exact age
  3. 3. any preserved traces of life
  4. 4. the ancient supercontinent
  5. 6. older rock layers are on the bottom
  6. 10. a break in the rock of earths crust