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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| tundra (tŭn'drə) Pronunciation Key
A cold, treeless, usually lowland area of far northern regions. The lower strata of soil of tundras are permanently frozen, but in summer the top layer of soil thaws and can support low-growing mosses, lichens, grasses, and small shrubs. |
A land area near the North Pole where the soil is permanently frozen a few feet underground.
Note: There are no trees on the tundra: the vegetation is primarily lichens and mosses.
Note: Tundra is widespread in Lapland and in the far northern portions of Alaska, Canada, and the Soviet Union.