Disc 4, track 1 Woman:Each biome is characterized chiefly by the dominant forms of plant life and prevailing climate.The largest biome on Earth is taiga. the taiga- also known as boreal or evergreen forest-is a broad band across North America,Europe, and Asia.Winters are long and cold, and summer are short,wet ,and sometimes warm. precipitation here is mostly in the form of snow. Moving northward,we have the arctic tundra here,which extends northward from the taiga and circles the North Pole.The tundra is the northernmost...uh...limit...for plants to grown.The vegetation is mostly..uh...sort of shrubby,low,mat-like plant forms.And about 20 percent of Earth's land sunface is tundra. We also have alpine tundra, a biome found on high mountaintops.Alpine tundra occurs in all latitudes.that means even in the tropics,anywhere the elevation is high enough.Here ,above the tree line,strong winds and cold temperatures create plant communities similar to those of arctic tudra. Man:Match each biome with the correct description.
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发表于 2006-8-31 22:11:00
发表于 2006-8-31 22:14:00
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