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Why do I need sunscreen on a cloudy day?

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Why do I need sunscreen on a cloudy day?

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Even though the sky may appear to be cloudy, some of the sun's rays are able to pass through the "cloud barrier". Make sure you still wear sunscreen on a cloudy day!

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Clouds reflect radiation. If a cloud will heat or cool a surface depends on its altitude, size, and the particles that form the cloud. The cloud reflects more short-wave radiation back to space than the surface would if the cloud wasn't there. In turn, it leaves less solar radiation to heat the atmosphere and surface. Clouds have the ability to absorb some of the heat.

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Why are clouds white? As "light passes through a cloud it interacts with larger water droplets which scatter all colors of the spectrum of light almost equally.  This means that the sunlight continues to remain white making the clouds appear white"(Met Office).

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Why are clouds white? As "light passes through a cloud it interacts with larger water droplets which scatter all colors of the spectrum of light almost equally.  This means that the sunlight continues to remain white making the clouds appear white"(Met Office).

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Other rays get trapped beneath the clouds, and continue bouncing between the  clouds and the ground. This creates the greenhouse effect. The rays insulate (heat) the ground.

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Other rays get trapped beneath the clouds, and continue bouncing between the  clouds and the ground. This creates the greenhouse effect. The rays insulate (heat) the ground.

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Some heat passes through the clouds, warming the ground.

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Some heat passes through the clouds, warming the ground.

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The sun's rays bounce off of the clouds.

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The sun's rays bounce off of the clouds.

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When there isn't any cloud cover, it is called a clear sky. This is when 0 to 1/10 of the sky has clouds.

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When there isn't any cloud cover, it is called a clear sky. This is when 0 to 1/10 of the sky has clouds.

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Clouds shield or drape over us so that some of the sun's harmful rays don't reach us.

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Clouds shield or drape over us so that some of the sun's harmful rays don't reach us.

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Think of clouds as a shield or a blanket.

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Think of clouds as a shield or a blanket.

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If you think that clouds aren't needed, you have no idea what you are talking about. Without them, we couldn't survive.

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If you think that clouds aren't needed, you have no idea what you are talking about. Without them, we couldn't survive.

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 The clouds help reduce the amount of sun we get. Without cloud cover we  could end up like the planet Venus. 

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 The clouds help reduce the amount of sun we get. Without cloud cover we  could end up like the planet Venus. 

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(Yep, you guessed it) Cloud cover is  when clouds cover a section/fraction of the sky.