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| A relatively large and distinct terrestrial area characterized by climate, soil, plants, and animals regardless where it's located. |
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| Occurs in extreme northern latitudes wherever the snow melts seasonally. |
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| Permanently frozen ground that varies in depth and thickness. |
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| A region of coniferous forests in the Northern Hemisphere; located just south of the Tundra in northern parts of North American and Eurasia. |
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| Temperate Deciduous Forest |
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| A forest biome that occurs in temperate areas where annual precipitation ranges from about 75 cm to 125 cm. |
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| A grassland characterized by hot summers, cold winters, and less rainfall then is found in a temperate deciduous forest biome. |
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| A biome with a Mediterranean climate (mild, moist winters and hot, dry summers); characterized by small-leaved evergreen shrubs and small plants. |
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| A fragile ecosystem in which lack of precipitation limits plant growth. |
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| The marked layering (separation into warm and cold layers) of temperate lakes during the summer. |
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| A marked and abrupt temperature transition in temperate lakes between warm surface water and cold deeper water. |
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