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26.3 MB (1.1 MB compressed)
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31.0 x 21.3 cm ⏐ 12.2 x 8.4 in (300dpi)
PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY
Cumulus clouds. View of large banks of cumulus clouds over a forest. These clouds have the typical "cotton wool" appearance. Cumulus clouds have rounded tops and those associated with rain are generally deep and dark in appearance, although not rising as high as cumulonimbus clouds. Cumulus may be formed at a frontal system boundary or as a result of thermal cell activity. They are typically between 300 and 1000 metres above the ground at their lowest point, and their depth varies generally between 500 and 1500 metres.
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