Across
- 5. An igneous rock layer formed when lava flows onto the Earth's surface and hardens.
- 8. Rock that forms when existing rock is exposed to high pressure or high heat or both.
- 9. Magma that reaches Earth's surface
- 11. The surface where a new rock layer meets a much older rock surface. This is a gap in the geologic record.
Down
- 1. The principle that in undisturbed rock layers, older layers of rock lie beneath younger rock layers
- 2. Fossils of widely distributed organisms that lived only during one short period.
- 3. An igneous rock layer formed when magma hardens beneath the Earth's surface.
- 4. The belief that the same natural laws and processes that operate in the universe now have always operated in the universe in the past and apply everywhere in the universe.
- 6. Molten rock beneath the earth's surface
- 7. The impression of an organism in a rock
- 10. A fossil copy of an organism made when a mold of the organism is filled with sediment or mineral deposits.