| Question |
Answer |
| fossil |
trace or remains of a plant or an animal in sedimentary rock |
| relative age |
age of an object compared with the ages of other objects |
| absolute age |
actual age of an object |
| evolution theory |
change of living things over time |
| extinction |
the condition of an entire species becoming extinguished or dead |
| uniformitarianism |
theory that geologic processes at work in the present were also at work in the past |
| gastrolith |
fossilized stone found within the digestive system of a dinosaur or other reptile |
| coprolite |
fossilized waste material from an animal |
| era |
largest unit of geologic time |
| law of superposition |
principle that a sedimentary rock layer is older than the layers above it and younger than the layers below it |
| law of crosscutting relationships |
principle that a fault or intrusion is always younger than the rock layers it cuts through |
| half-life |
time required for half the mass of a radioactive element to decay into its daughter elements |
| correlation |
naming two layers of rock as a match, therefore saying that they were laid down at the same time |
| radioactive decay |
the radioactive process in which a nucleus undergoes spontaneous transformation into one or more different nuclei and simultaneously emits radiation, loses electrons, or undergoes fission. |
Buen Viaje lv.2 ch 8
