Across
- 5. This law helps scientists determine the age of fossils, relatively speaking
- 6. Provides indirect evidence of life in the past rather than the body of the animal itself
- 8. This age dating is when two different rock strata in different areas on Earth Contain the same index fossils, the strata is probably the same
- 12. Special fossils; they indicate to geologists the boundaries in geological time
- 13. Groundwater carries dissolved minerals into the pores and cavities of bone, wood, or shells
- 15. most accurate form of dating is also called radiometric dating
Down
- 1. The process by which all substances of plants and animals decay, except carbon
- 2. Result in organic material converting into stone or a similar substance; two types
- 3. This era began about 65 mya, the modern form of human species started in this era. Also inclues the present
- 4. When water dissolves the original material then replaces them with mineral matter
- 7. This era began about 240 mya and the start of the age of the dinosaurs and dinosaur extinction was in this era.
- 9. An animal can become trapped in __ and the whole body can be preserved. ____ can also trap whole animals
- 10. Captures insects and other invertebrates; it hardens and they have preserved in the resin including their DNA
- 11. This era began about 540 mya, was the age of ancient life, no human species was here.
- 14. When any living object or things no longers exists