Earth History

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Across
  1. 2. Rock that has formed when sediment transported by water (rivers, lakes, and oceans), ice (glaciers), and wind compress to form a solid.
  2. 4. A scientist that studies fossils.
  3. 5. A widely distributed fossil of a narrow range in time, used to determine the age of related rock formations. (2 words)
  4. 8. The movement of magma onto the surface of the earth through volcano craters and cracks in the earth's crust, forming igneous rock.
  5. 9. A comparison of age based on which object (or event) is older or younger than some other object or event.(2 words)
  6. 11. one of several subdivisions of geologic time enabling cross-referencing of rocks and geologic events from place to place.
Down
  1. 1. The true age of a rock or fossil that tells scientists the number of years ago a rock layer formed. (2 words)
  2. 3. Rock that is formed when magma or lava cools and forms a solid.
  3. 5. cylinders of ice drilled from glaciers and ice sheets. (2 words)
  4. 6. The entry of molten rock or magma into or between other rock formations.
  5. 7. The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
  6. 10. A division of geologic time marked by distinctive developments and events.