Which clouds are formed at high altitudes and have a feathery appearance ?
Cirrus clouds
Clouds are classified by their shape and the height at which they form. The four basic types described in NCERT geography are cirrus, cumulus, stratus and nimbus.
Cirrus clouds form at high altitudes, about 8,000 to 12,000 metres, where the air is very cold, so they are made of ice crystals. They are thin and detached, look like feathers or wisps of hair, and are always white.
Nimbus clouds are dark grey or black rain-bearing clouds that form low or in the middle levels. Stratus clouds are layered sheets covering large parts of the sky at low levels. Cumulus clouds look like cotton wool and form at about 4,000 to 7,000 metres with flat bases.
Cirrus clouds option is correct.
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