| Definition | Term |
|---|
| Era that is often called the Age of Reptiles | |
| Magma that cools and hardens into a mass of igneous rock below the surface | |
| Era that is often called the Age of Mammals | |
| Process in which plants use energy from the sun to make their own food | |
| Lava that hardens on the surface | |
| A warm-blooded vertebrate that feeds its young milk | |
| Three long units of time that geologic time is divided into | |
| A type of fossil consisting of an extremely thin coating of carbon on rock | |
| A solid copy of the shape of an organisms | |
| An animal that lives part of its life on land and part of its life in water | |
| Fossils in which minerals replace all or part of an organism | |
| The preserved remains of organisms are sometimes found in this, which is the hardened sap of evergreen trees | |
| Fossils used to help geologists match rock layers | |
| Animals without backbones | |
| The number of years since a rock has formed | |
| Waste product of photosynthesis that helped to change Earth's atmosphere | |
| Intrusions and extrusions are always _____ than the rock around them. | |
| Animals with backbones | |
| If an element does not change under normal conditions, it is said to be _____ | |
| Geologists use the law of _____ to determine the relative ages of sedimentary rock layers. | |
| Units of geologic time that eras are divided into | |
| Long span of time that geologic time begins with | |
Periodic Table
Planets from the Sun
Digits of Pi
