| A | B |
| decade | ten years |
| millennium | one thousand years |
| century | one hundred years |
| land & water | the earth's surface |
| hunt & gather | earliest people get their food |
| archaeologists | dig carefully for clues |
| climate | weather a place tends to have |
| deserts, forests, tundra, forests | the four vegetation regions |
| longitude | vertical imaginary lines |
| latitude | horizontal imaginary lines |
| Ice Ages | extremely cold weather patterns |
| tool | something people use to help them |
| domesticate | to tame |
| settlements | early communities |
| pictograph | a picture that tells a story |