Across
- 2. the idea that Earth has always changed in uniform ways and that the present is the key to the past.
- 3. any animal or plant preserved in the rock record of the Earth
- 7. he approximate age of a specific rock layer
- 9. a manmade lake that is created when a dam is built on a river
- 10. the basic unit of geologic time
- 13. a living organism that shapes its environment.
- 15. calculates an age in years for geologic materials
- 16. involves the use of energy released by inorganic chemical reactions to produce food.
- 17. unit of geological time during which a rock series is deposited
- 18. a break in time in an otherwise continuous rock record
- 20. a process where plants eat the sunlight
- 23. a columnar diagram that shows the rock formations of a locality or region
- 24. preserved remains of an species
- 25. one of the principles of geology scientists use to determine the relative ages of rock strata, or layers.
Down
- 1. a principle of geology that states that the geologic feature which cuts another
- 4. Measure of the magnitude of a real number, complex number, or vector
- 5. the earliest of the geologic ages
- 6. when 75% or more of life die
- 8. a non-living part of an ecosystem that shapes its environment
- 11. a measure of the amount of inflow or outflow such as through the side of a fixed volume,
- 12. a very long span of geologic time
- 14. the study of the history of life on Earth as based on fossils.
- 19. A fossil consisting of an imprint of or a mark left by an organism, as opposed to physical remains
- 21. The time it takes for half of the atoms in a substance to decay
- 22. the change in heritable traits of biological populations over successive generations