| A | B |
|---|
| a comparison of the age of one thing to the age of another | relative age |
| the exact age of something | absolute age |
| the preserved remains of living things | fossil |
| a type of fossil from an organism that lived for a short time that is widely distributed, is easy to recognize, and assists with relative dating | index fossil |
| a geologic principle that states that in horizontal rock layers, each layer is younger than the one below it | law of superposition |
| Fossils provide __________ of evolution and changes to Earth’s surface and climate. | evidence |
| The process of determining relative age is called ____________. | relative dating |
| The principle of original horizontality helps scientists determine ____ age. | relative |
| A fault is a ______ in Earth’s surface. | crack |
| An ______ causes gaps in the geologic record. Unconformities occur for two reasons | unconformity |
