wind

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20 08, 2017

Where do tornadoes come from? – Weather – Earth science

By |2018-05-31T11:49:23-07:00August 20th, 2017|Physics|0 Comments

A tornado wrecked a town in northern France When there's wind coming from more than one direction at the same time, sometimes the air begins to spin around in one place. This is especially likely when a hot, wet wind coming from the south hits a cold, dry wind coming from the north. Both winds [...]

20 08, 2017

Why does it rain? Weather – Earth science

By |2017-08-20T18:07:53-07:00August 20th, 2017|Physics|0 Comments

Thanks to Rocbike for the great picture! When the Earth first formed, about 4.5 billion years ago, it didn't rain here. Until about four billion years ago, Earth was too hot for raindrops to form, and water just hung in the air as steam without falling as rain. Then as the Earth's surface began to cool, in the Archaean era, huge clouds formed and began [...]

20 08, 2017

Nimbus clouds – Rain clouds – Weather

By |2018-11-09T06:53:08-07:00August 20th, 2017|Physics|5 Comments

Cumulonimbus clouds are a type of nimbus cloud What is a nimbus cloud? Nimbus clouds often mean that a thunder storm is brewing: there may soon be thunder and lightning. Get out of the swimming pool! What causes thunderstorms? Other kinds of clouds More about weather Nimbus is a fancy word, but it really just means [...]

20 08, 2017

What makes thunder and lightning? – Weather science

By |2018-04-24T15:20:20-07:00August 20th, 2017|Physics|0 Comments

A bolt of lightning in the sky Hot air and cold air are constantly moving around the Earth, as the hot air rises and the cold air sinks - that's what makes wind. Sometimes as this airmoves around, it gets more exciting than just wind, though. A thunderstorm begins when the wind picks up a lot of water from the [...]

20 08, 2017

Why does earth have weather? – Earth Science

By |2017-08-20T17:40:27-07:00August 20th, 2017|Physics|0 Comments

A thunderstorm in South Africa The weather on Earth happens because of the evaporation and condensation of water, and because of the spinning of the earth and the tilt of the earth on its axis. Does it seem strange that such quiet things could cause big thunderstorms and huge waves and blizzards? Here's why. Because the Earth is tilted on its axis, [...]

20 08, 2017

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

By |2018-09-19T08:16:28-07:00August 20th, 2017|Physics|7 Comments

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 [...]

20 08, 2017

Kleenex balloon – Hot air rises project

By |2018-05-31T11:49:22-07:00August 20th, 2017|Physics|0 Comments

Making your own hot air balloon (Thanks to American Aircraft Modeler) You can make your own tiny hot air balloon to see how hot air rises and then cools down and sinks again. Take a Kleenex tissue or some toilet paper and glue the edges to a circle of light string with tiny [...]

19 08, 2017

What’s the atmosphere? Weather science

By |2019-02-05T05:47:27-07:00August 19th, 2017|Physics|0 Comments

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 [...]

18 08, 2017

What is gravity? Physics

By |2019-03-01T04:44:58-07:00August 18th, 2017|Physics|0 Comments

What is gravity? The Moon orbiting Earth (taken from space) - NASA What does gravity do? Gravity attracts all objects towards each other. Gravity has been around since the very beginning of the universe, and it works the same way everywhere in the universe, on all kinds of different objects, of all different sizes [...]