Across
- 4. contacts between rock that show a break in the geologic record caused by a period of erosion or pause in sediment accumulation
- 7. rock formed after weathering, erosion, deposition, compaction and cementation
- 11. describes what happens in nature under certain conditions
- 13. exposed rock formation at the earth’s surface
- 14. one scientist conducts an experiment multiple times to increase accuracy.
- 16. method of determining the age of an object based on its physical characteristics
- 18. rock formed under intense heat and pressure
- 19. the remains or traces of ancient organisms preserved in geological formations
- 20. igneous rock formed above the surface
- 21. explains why or how something happens
- 22. plant or animal that is preserved in the rock record and are characteristic of a particular geologic time
- 23. method of determining the age of organic materials
Down
- 1. calendar for events in earth’s history measured in eons eras periods epochs and ages
- 2. each layer of rock is older than the layer above it
- 3. when eroded sediments come to rest
- 5. a group of different scientists perform the same experiment
- 6. movement of sediment by wind or water
- 8. process where rocks transform from one type of rock to another
- 9. minerals harden in cracks between sediments
- 10. the variety of life in the world
- 12. igneous rock formed below the surface
- 15. rock formed by cooling molten rock
- 17. breaking down or dissolving of rocks and minerals
- 18. a naturally occurring inorganic element or compound with orderly structure and chemical composition