Across
- 4. the actual or exact age of a rock or fossil or how long ago it formed
- 6. in undisturbed sedimentary rock layers, older layers of rock lie beneath younger rock layer
- 9. an igneous rock that forms when magma cools and hardens after cutting throughe xisting rock layers
- 10. describes the age of a rock or fossil in comparison to another rock or fossil
Down
- 1. the science of the study of Earth
- 2. a gap in the rock record
- 3. the technique scientist use to determine the absolute age of a material
- 5. and rock fragments that's included inside of another rock is older than the rock in which it is included
- 7. any feature that cuts across a sequence of rocks is younger than everything it cut
- 8. forms of life which existed during limited periods of geologic time