| Term | Definition |
|---|
| agricultural revolution | The revolutionary transformation of agricultural practices, systems, and production. |
| animal domestication | When people started to keep animals for pets and food. |
| climatic regions | The different regions with different climates. |
| deglaciation | The withdrawl of an ice sheet from an area. |
| fertile crescent | Crescent-shaped zone of productive lands extending from near the southeastern Mediterranean coast through Lebanon and Syria to the alluvial lowlands of Mesopotamia. Once more fertile that today, this is one of the world's great source areas of agricultural and other innovations. |
| glacier | Frozen blocks of ice. |
| global worming | A period when glaciers were driven back. |
| holocene epoch | The current interglacial period, extending from 10,000 years ago to the present on the geologic time scale. |
| interglaciation | Sustained warming phase between glacial advances during an ice age. |
| late cenozoic ice age | The last great ice age that ended 10,000 years ago. |
| paleolithic | The old stone age, the earliest period of human development that is approximately coextensive with the Pleistocene epoch beginning over 2 million years ago and ending between 40,000 and 10,000 years ago, when communities subsisted on hunting and gathering and used tools of stone, bone, and ivory. |
| plant domestication | Organized, plant domestication. |
| social stratification | The differentiation of society into classes based on wealth, power, production, and prestige. |
| stone age | The period when simple stone tools were used. |
| ziggurat | A lofty ancient Babylonian temple tower that symbolized power and authority. |
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