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Why is the sky blue? Weather science

By |2017-08-20T23:42:12-07:00August 20th, 2017|Physics|

Blue sky with cirrus clouds This is an easy question to ask but the answer is pretty hard. The light that comes from the Sun to Earth looks white, but really it is made up of all different colors of light mixed together. You can see this by using a glass of water or a glass prism to break up [...]

What causes wind (Hot air rises) – Wind and weather Science

By |2018-09-19T08:16:28-07:00August 20th, 2017|Physics|

Hot air balloon - hot air rising is what causes wind Hot air is lighter than cold air When something is hot, its molecules are farther apart than when it is cold. When air is hot, its molecules are further apart, so it takes up more room. That makes hot air lighter than cold air, because the [...]

Why is the sky blue? A science project

By |2017-08-20T14:53:06-07:00August 20th, 2017|Physics|

A cloudy glass of water You can see for yourself that blue light scatters more than red light. This is the same way that John Tyndall showed why the sky was blue in 1859. Fill a drinking glass with water, and then add two spoonfuls of milk - almond milk is okay if you are dairy-free [...]

Cumulus clouds – Weather – Science

By |2019-04-29T19:12:14-07:00August 20th, 2017|History|

These are cumulus clouds. They are puffy. What is a cumulus cloud? Cumulus clouds are clouds that are piled up on top of each other. "Cumulus" means a pile in Latin, as in our word "accumulate" meaning to pile up. They are puffy clouds. What are clouds made of? Nimbus clouds Stratus clouds All our weather [...]

What are clouds made of? Weather science

By |2019-04-11T15:45:46-07:00August 20th, 2017|History|

Clouds in the sky. What are clouds? Clouds are made of water What are clouds? Clouds are made of drops of water or ice. When the wind picks up water from the ocean or from the land on Earth, it can carry tiny drops of water up into the sky. These drops are too small for you to see. [...]

What’s the atmosphere? Weather science

By |2019-02-05T05:47:27-07:00August 19th, 2017|Physics|

Earth's atmosphere: Did the Earth look like this right after it cooled down? What is the atmosphere? The atmosphere is the air that is wrapped all around a planet. Read more about planets Why is the sky blue? All our physics articles Do all planets have atmospheres? Not all planets have atmospheres. In order [...]

Rainbows and water – a sun project

By |2018-05-31T11:49:25-07:00August 18th, 2017|Physics|

Sunshine through the clouds and Earth's atmosphere You can see that the sunlight that reaches the Earth travels at different wavelengths. On a sunny day, put a full glass of water (a real glass glass) in the sunshine on your windowsill. Look where the sunshine goes through the water, and you should see rainbows on the floor or walls. [...]

Radioactivity and sunburns – Physics

By |2018-04-24T12:26:12-07:00August 17th, 2017|Physics|

Radiation from the sun caused this sunburned back The most common kind of radiation is sunlight, and the most common cause of injury from radiation is a sunburn. Just like radioactivity from a nuclear explosion, radiation from the sun can damage the DNA of your cells. Later the same day, or the next day, your skin may be red and sore. [...]

What is light made of? Why is the sky blue?

By |2018-05-31T11:49:14-07:00August 16th, 2017|Physics|

Rainbow over Amazon river Light is made of billions of tiny particles called photons. These photons travel from one place to another in waves. Visible light is the subset of photons that move at a wavelength that we can see. Among the different photons that are in visible light, the ones that have the [...]

What is photosynthesis? Plant Biology

By |2018-04-16T00:37:36-07:00May 29th, 2017|Biology|

Chloroplasts (seen through a microscope) Photosynthesis is the way some cells on Earth pull in light from the sun and use it to make energy to repair and reproduce themselves. The first cells could not photosynthesize (foe-toe-SIN-the-size). They got food by breaking apart hydrocarbon molecules. But a little more than three billion years ago, [...]