Key Terms from Historical Context

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Hunter-gatherers

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People who survive by hunting animals and gathering plants for food.

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Western Hemisphere

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The half of the Earth that includes North and South America.

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Asia

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The largest continent, located primarily in the Eastern and Northern Hemispheres.

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North America

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A continent in the Northern Hemisphere, bordered by the Arctic Ocean, Atlantic Ocean, and Pacific Ocean.

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Sea level

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The average level of the surface of the ocean, used as a standard in reckoning land elevation or sea depths.

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Ice Age

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A glacial period during which ice sheets covered significant portions of the Earth's surface.