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 [...]
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 [...]
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, [...]
Nimbus clouds – Rain clouds – Weather
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 [...]
What makes thunder and lightning? – Weather science
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 [...]
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 [...]
What are hurricanes? Weather science
A hurricane in Cuba - Hurricanes happen near the equator What is a hurricane? A hurricane (also called a typhoon or a cyclone) is basically a huge spinning wind. Okay, then [...]
What causes wind (Hot air rises) – Wind and weather Science
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 [...]
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, [...]
Tornado in a bottle – Weather science project
A tornado in a bottle You can make your own tornado to see how it works. Fill a one or two liter bottle, like a soda bottle, with water. Add a bunch of [...]
