Why is the sky blue? Weather science
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 [...]
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08, 2017
Where do tornadoes come from? – Weather – Earth science
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 [...]
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08, 2017
What is snow? Weather – Earth science
If it's colder, rain may fall as snow. About two and a half billion years ago, the Earth finally cooled down enough for it to snow for the first time. Most of the [...]
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08, 2017
What causes the seasons? Earth science
This is why it's hotter in summer and colder in winter. The reason it is sometimes winter and sometimes summer is that the Earth spins on a slightly tilted axis. You can [...]
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08, 2017
Why does it rain? Weather – Earth science
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, [...]
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08, 2017
Why does earth have weather? – Earth Science
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 [...]
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08, 2017
What’s the equator? Geography and the Earth
This globe shows the equator running around the widest part of the Earth. Where is the equator? The equator is an imaginary line running around the widest part of the Earth, [...]
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08, 2017
What are planets? Astronomy – Space science
What are planets? The planet Venus from space Before there were planets For several hundred million years after the Big Bang, there were no planets, only stars. Planets couldn't form until the [...]
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08, 2017
The Moon – Astronomy – Physics
Earth's moon (about 239,000 miles from Earth) (That's almost ten times as far as going all the way around the Earth) Where did the moon come from? Nobody knows exactly [...]
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08, 2017
Meteors – Shooting stars – Astronomy
Lyrid meteor shower What is a meteor? Meteors or meteorites are bits of rock (like granite) and ice - usually a mixture of rock and iron and nickel but sometimes just rock or [...]
