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cloud
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Introduction References & Edit History Related Topics
Images & Videos
View a time-lapse video of cloud formations rolling across the sky followed by a thunderstorm
How do clouds float?
Learn about the four main types of clouds formed at different altitudes
What is cloud seeding and can it be used to fight climate change?
cloud: cumulonimbus lightning: cloud-to-ground Sun Middle clouds(Top to bottom) Altocumulus undulatus, a layer of shaded, regularly arranged rolls; altocumulus perlucidus, a white and gray layer in which there are spaces between the elements; altostratus translucidus, showing the Sun as if seen through ground glass; altocumulus radiatus, a layer with laminae arranged in parallel bands. cloud vortices false-colour mosaic of the Great Red Spot
For Students
cloud summary
Quizzes
Lightning over a farm field. Weather electricity thunderstorm light energy tree
Facts You Should Know: Weather Quiz
Umbrella colored like a rainbow sticking out above a sea of black umbrellas while it rains. (storm, weather)
Weather Words Vocabulary Quiz
Model of a molecule. Atom, Biology, Molecular Structure, Science, Science and Technology. Homepage 2010 arts and entertainment, history and society
Science Quiz
rain. Child in the rain, wearing a rain coat, under a yellow umbrella. April Showers weather climate rain storm water drops
April Showers to March’s Lions and Lambs
ten types of clouds and their elevation: cirrus, cirrocumulus, cirrostratus, altocumulus, altostratus, nimbostratus, stratocumulus, stratus, cumulus, cumulonimbus
Earth’s Atmosphere and Clouds
Read Next
Lightning over the outskirts of Oradea, Rom., during the thunderstorm of August 17, 2005.
16 Questions About Earth’s Atmsophere and Weather Answered
Hot-air balloon against a sky (clouds, hot air ballooning, recreation)
Why Is the Sky Blue?
Discover
Panama Canal infographic
Timeline and Map of the Panama Canal
Hemp (Cannabis sativa).
9 Mind-Altering Plants
Nativity Scene, Adoration of the Magi, Church of the Birth of the Virgin Mary, Montenegro
Why Is Christmas in December?
Ahura Mazda - relief of the Zoroastrian god Ahura Mazda at the ancient ruins of Persepolis in Iran. Also known as Ormazd Zoroastrianism,
Which Religion Is the Oldest?
Coriander leaves, fresh green cilantro on wooden background, herbs
Why Does Cilantro Taste Like Soap to Some People?
Saint Lucia Day. Young girl wears Lucia crown (tinsel halo) with candles. Holds Saint Lucia Day currant laced saffron buns (lussekatter or Lucia's cats). Observed December 13 honor virgin martyr Santa Lucia (St. Lucy). Luciadagen, Christmas, Sweden
7 Winter Solstice Celebrations From Around the World
The Jeff Koons tulips sculputure outside the Guggenheim Museums in Bilbao, Spain, Basque Country.
What’s the Difference Between Modern and Contemporary Art?

cloud

meteorology
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cloud, any visible mass of water droplets, ice crystals, or a mixture of both that is suspended in the air, usually at a considerable height (see video). Fog is a shallow layer of cloud at or near ground level. Clouds are formed when relatively moist air rises. As a mass of air ascends, the lower pressures prevailing at higher levels allow it to expand. In expanding, the air cools adiabatically (i.e., without heat exchange with the surrounding air) until its temperature falls below the dew point, upon which the air becomes supersaturated such that water vapour condenses onto cloud condensation ...(100 of 756 words)

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