| A | B |
|---|
| circa | used with approximate dates |
| BCE/BC | Before the Christian Era; Before Christ |
| AD/CD | in the year of the Lord; since Christ was born |
| archaeology | scientific study of historic or prehistoric peoples & cultures |
| glacier | a slowly moving ice mass |
| ice age | a time when much of the Northern Hemisphere was covered by great ice sheets |
| land bridge | a strip of land that connects adjacent continental landmasses |
| migrate | to move from one place to another |
| nomadic | pertaining to a wandering people, with no permanent home |
| evolution | a process of gradual progressive change |
| culture | the behaviors & beliefs characteristic of a particular group |
| flint | a hard stone used for striking fire |
| pre-history | before history, or before writing was invented |
| history | the recorded events of people |
| artifact | any object made by human beings, often a tool; a remain from a previous culture |
| era | period of time marked by distinctive character, events |
| century | a period of 100 years |
| millennium | a period of 1000 years |
| decade | a period of ten years |
