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=Answer= When warm, moist air rises very quickly, deep cumulonibus storm clouds form. Ice crystals and water droplets whirl around inside the clouds and bump into each other, making tiny electric charges. The charges build up until huge electric sparks flash from cloud to cloud or down to the ground and back. The lightning flash heats up the air as it passes. The air expands very rapidly and makes the booming noise we call thunder. Hope this helps.

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14y ago
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14y ago

Some clouds are white and some are "black" due to two chief reasons: 1) optical thickness and 2) viewpoint and/or background (contrast). Concerning optical thickness: it is a technical term that just means that a thicker cloud has more droplets of water for the light to scatter off of. This can be due to either the physical thickness of the cloud or the density of the droplets, or both. For a sufficiently thick cloud (that has sufficient optical thickness) a bunch of the light is scattered back in the general direction from which it came as well as sideways and forwards, to there's just not as much light getting "through" the cloud to the ground. Up in the sky, thin clouds (like cirrus clouds) usually look white, but not thick clouds. The thicker ones look dark, but they are really just darker than the sky. It is the contrast that makes them look "black".

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11y ago

A storm cloud, or cumulonimbus, is extremely tall, it's height maxing out at the base of the stratosphere. Because this cloud is so thick, not much sunlight can penetrate through the cloud, so it appears dark.

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14y ago

Because all the precipitation is gathering clouding up the blue and causing grey dark skies.

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15y ago

hi tash the fairy queen from you know who(AliG)hows caistor?

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Q: What makes the sky darken during a storm?
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