Meteorology · Clouds
Cirrus clouds are:
- AHigh, wispy clouds composed of ice crystals✓ Correct
- BLow, dense rain clouds
- CSurface-level fog
- DTowering storm clouds with anvil tops
Explanation
Cirrus are high-altitude clouds (above ~20,000 ft) made of ice crystals, appearing as thin, feathery streaks. Increasing and thickening cirrus often signals an approaching warm front or organized system.
Authority: Bowditch (Pub. No. 9)
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