| A | B |
|---|
| PANGAEA | SUPERCONTINENT FORMED AT THE END OF THE PALEOZOIC ERA |
| FOSSILS | RECORDS OF ANCIENT LIFE |
| ABSOLUTE AGE | ACTUAL AGE OF A ROCK |
| GEOLOGIC TIME SCALE | SEQUENCE OF EVENTS ON EARTH BASED ON THE ROCK RECORD |
| PLATE TECTONICS | PRESENT THEORY OF CONTINENTAL MOVEMENT |
| SUPERPOSITION | PRINCIPLE THAT YOUNGER ROCK LAYERS ARE DEPOSITED OVER OLDER LAYERS |
| INDEX FOSSILS | FOSSILS OF ORGANISMS THAT LIVED ONLY AT A PARTICULAR TIME BUT IN MANY PLACES |
| UNCONFORMITY | A BURIED EROSION SURFACE |
| RELATIVE AGE | A ROCK'S AGE COMPARED TO OTHER ROCKS |
| PALEOMAGNETIC DATING | DETERMINING ROCKS' AGES BY STUDYING THE ALIGNMENT OF MAGNETITE GRAINS |
| SEAFLOOR SPREADING | PROCESS THAT CREATES NEW OCEAN PLATE MATERIAL AT MID-OCEAN RIDGES |
| UNIFORMITARIANISM | IDEA OF CONTINUOUS CHANGES CREATING THE EARTH'S GEOLOGIC FEATURES |
| RADIOMETRIC DATING | METHOD FOR FINDING THE ABSOLUTE AGE OF A ROCK USING RADIOACTIVITY |
| CORRELATION | FINDING OUT HOW ROCKS AT DIFFERENT LOCATIONS COMPARE IN AGE |
| FORMATION | ROCK UNIT USED FOR CORRELATION |
| ERA | LARGEST DIVISION OF THE GEOLOGIC TIME SCALE |
| TRILOBITES | IMPORTANT INDEX FOSSIL OF THE PALEOZOIC ERA |
| MESOZOIC ERA | PANGAEA BEGAN TO BREAK APART |
| CENOZOIC ERA | EVIDENCE OF HUMAN LIFE |
