Discussion
Since the atmospheric moisture decreases with altitude, the condition becomes unfavourable for snow formation at particular height. This is demarcated by an imaginary snow line known as ................. .
Answer: A
The keyed answer is Hinosphere, the paper's spelling of the chionosphere.
The chionosphere is the layer of the atmosphere, and the zone of the Earth's surface, in which snow can persist through the year. Its lower boundary is the snow line. Above a certain height the air becomes too dry for further snow accumulation, which is the upper limit the stem refers to, so the snow line demarcates this zone.
A snow patch is a small, isolated patch of snow that survives into summer. A glacial trough is a U-shaped valley carved by a glacier, and a nunatak is a rock peak projecting above an ice sheet. None of them is the zone bounded by the snow line.
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