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