Alpine pastures comprise areas situated above approximately ______ elevation and below the perpetual snow line:
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Answer: A. 3000 m
Explanation
Alpine pastures comprise high-altitude ecological zones situated above 3000 meters elevation. They occupy the terrain lying directly below the permanent snow line. The specified 3000 meter threshold accurately marks the lower boundary of alpine pastures. Extreme cold and short growing seasons prevent tree growth in high alpine pasture zones. Vegetation consists primarily of low-growing perennial grasses, sedges, and colorful wildflowers. Melting snowpacks provide essential seasonal moisture for fragile alpine plant communities.
Nomadic pastoralists drive livestock to alpine pastures for summer grazing traditions. Climate warming threatens alpine ecosystems by shifting vegetative zones to higher altitudes. Mountain climbers and researchers traverse these high-elevation pastures during expeditions. Option B proposes 4000 meters, which underestimates the broader altitudinal range of pastures. Option C suggests 5000 meters, placing the boundary too close to the permanent snow line. Option D lists 6000 meters, an elevation generally locked in perpetual snow and ice.
- Subject
- Agriculture
- Category
- Forestry
- Topic
- —
- Difficulty
- medium
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