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Precipitation, which is a general term for rain, sleet, snow and hail, is a major factor in the earth’s water cycle. Precipitation comes from clouds, which are a mass of tiny water droplets or ice crystals, or both, suspended in the atmosphere. If a cloud saturated with water vapour cools down to its dew point (when water vapour turns from an air mass into a liquid or solid state) this water vapour eventually returns to earth in the form of precipitation. Clouds as you can see in these pictures reflect all visible wavelengths of light equally and thus are white, but they can appear grey or even black if they are so thick or dense that sunlight cannot pass through.
There are various cloud classifications but meteorologists generally use an internationally agreed form based on cloud appearance and height. This uses 10 principles:
Cirrus cirrostratus and cirrocumulus are high clouds, normally above 5000 metres.
Altocumulus and altostratus are medium-high clouds at about 2000 – 5000 metres.
Stratus, stratocumulus and nimbostratus are clouds at levels below 2000 metres.
There are also clouds which form vertically and so cannot be classified by height; these are generally known as cumulus and cumulonimbus clouds.


Clouds info
cloud01.jpg (1320542 Byte) picture cloud photo
cloud02.jpg (1499263 Byte) cloud photo pictures
cloud03.jpg (1645356 Byte) clouds photo picture
cloud04.jpg (1764467 Byte) cloud pic photo
cloud-05.jpg (1343384 Byte) clouds, sw USA, picture
cloud-06.jpg (1106424 Byte) clouds picture
cloud-07.jpg (1131087 Byte) clouds picture
cloud-08.jpg (1137693 Byte) clouds picture
cloud-09.jpg (1213175 Byte) cloud picture
cloud-10.jpg (1102675 Byte) white cloud pic
cloud-11.jpg (1374936 Byte) pic cloud
cloud-12.jpg (1329031 Byte) image cloud
cloud-13.jpg (1178136 Byte) photo cloud
cloud-14.jpg (1099774 Byte) picture cloud
cloud-15.jpg (1177658 Byte) cloud picture
cloud-16.jpg (1035721 Byte) cloud image
clouds-b6zw.jpg (1451409 Byte) mountains clouds picture
clouds-y0o2.jpg (1360198 Byte) vapour trail photo
clouds-city-5t1.jpg (1359226 Byte)
clouds-9ay3.jpg (1598712 Byte)
clouds-i8m8.jpg (1442785 Byte)
rainbow-sl3.jpg (1365109 Byte)
rainbow-8d3.jpg (1391704 Byte)
rainbow-g5y.jpg (1457778 Byte)
cloud-xa8a.jpg (1322476 Byte)
clouds-f9o3.jpg (1208940 Byte)
cloud-8cm4.jpg (1318883 Byte)
cloud-s92i.jpg (1031925 Byte)
clouds-1q7.jpg (1248396 Byte) photo cloud
clouds-1qm.jpg (1366814 Byte) cloud sky picture
clouds-8c4.jpg (1300079 Byte) cloud photo
clouds-ay7.jpg (1095432 Byte)  clouds pictures
clouds-i8s.jpg (1184251 Byte) images clouds
cloud-e4y0.jpg (1134017 Byte) sky blue clouds
clouds-1yp0.jpg (1068200 Byte) grey cloud
clouds-3ap1.jpg (1391623 Byte) pictures of clouds
clouds-6r4c.jpg (1654668 Byte) picture white cloud
clouds-6xo1.jpg (1111707 Byte) picture cloud
cloud-sl8w.jpg (1057747 Byte) photo clouds
clouds-9v2k.jpg (1351116 Byte)
clouds-c7ql.jpg (1030364 Byte)
clouds-chm8.jpg (1216898 Byte) picture of clouds
clouds-h01q.jpg (1343238 Byte) image of clouds
clouds-u5d0.jpg (1470754 Byte) grey cloud
clouds-uan3.jpg (1184782 Byte) photo of cloud
clouds-fm9q.jpg (1408768 Byte) clouds images
clouds-jwn6.jpg (1121413 Byte) white cloud sky
clouds-l3sk.jpg (1193646 Byte) large picture cloud
clouds-vek8.jpg (1031816 Byte) photo cloud
clouds-3sly.jpg (1336583 Byte)
clouds-5xl3.jpg (1304108 Byte)
clouds-9s0q.jpg (1379843 Byte)
clouds-a0o1.jpg (1445464 Byte)
clouds-fsy8.jpg (1129879 Byte)
clouds-fx3w.jpg (1278236 Byte)
clouds-m6n7.jpg (1292195 Byte) cloud sky picture
clouds-mal2.jpg (1358203 Byte) white clouds
clouds-nvh5.jpg (1260834 Byte)
clouds-vap2.jpg (1274294 Byte) sky photo cloud
clouds-xp3k.jpg (1277574 Byte)
cloud-c48w.jpg (1128243 Byte)
cloud-fk3l.jpg (1547430 Byte)
cloud-m8iw.jpg (1316517 Byte) stock photos
cloud-x02k.jpg (1320119 Byte) stock pictures
clouds-v6q0.jpg (1318525 Byte) image cloud
cloud-c3a7.jpg (1147919 Byte) white cloud, blue sky
clouds-0o5y.jpg (987860 Byte)
clouds-2lq7.jpg (1322013 Byte)
clouds-4x3l.jpg (1215611 Byte)
clouds-6e8w.jpg (1150218 Byte)
clouds-76zt.jpg (1057327 Byte)
clouds-92w3.jpg (1383476 Byte) image of cloud
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clouds-g6h5.jpg (770633 Byte)
clouds-j8j5.jpg (1035571 Byte)
clouds-lo0w.jpg (880263 Byte) dark cloud photo
clouds-uqpw.jpg (1161283 Byte) white cloud
clouds-x2y2.jpg (915137 Byte)
cloud-6ga7.jpg (1328279 Byte) cirrus
clouds-1qo.jpg (1065019 Byte)
clouds-l6v8.jpg (1086100 Byte)
clouds-n7t5.jpg (1357603 Byte)
clouds-v5t5.jpg (1086344 Byte)
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cloud-rain-j2z.jpg (1367849 Byte)
clouds-u76t.jpg (1024092 Byte)
cloud-9mi2.jpg (1146746 Byte)
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clouds-lake-i9r.jpg (1719564 Byte)
cloud-z20w.jpg (1367693 Byte)
cloud-i3ow.jpg (1284471 Byte)
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clouds-zrw9.jpg (1121833 Byte)