| A | B |
|---|
| relative dating | finding the age of an object compared to other objects |
| absolute dating | finidh the age of an object in years |
| geologic time scale | standard method used to divide Earth's history |
| plate tectonics | theory explaining how Earth's plate move and change |
| Precambrian time | extended from Earth's formation to about 500 mya |
| Paleozoic era | Ancient Life |
| Mesozoic era | age of the reptiles |
| Cenozoic era | present era |
| primate | group of mammals with binocular vision and opposable thumbs |
| hominids | group of primates that walk upright |
| Homo sapiens | modern humans |
| Neanderthals | now extinct hominids that lived at the same time as Homo sapiens |
| australopithecines | early hominids which were similar to apes |
