Stratus clouds (thanks to NASA) What are stratus clouds? If you see stratus clouds, that's the time to get inside and stay there. Stratus clouds mean rain if it is warm and snow if it [...]
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, [...]
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 [...]
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 [...]
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 [...]
See how the degrees match up. To prove to yourself what temperature water freezes and boils at, fill a pan with ice from the freezer. Stick a thermometer in it (not a fever thermometer! Use [...]
Track how long the days are and how warm it is at different places all over the world You can track the changing seasons for yourself. Try writing down in [...]
Any desk lamp will do for this du Chatelet light project What is the du Chatelet light project? Emilie du Chatelet was a scientist who lived in France in the [...]
See how the degrees match up. Many hot things take up more room than the same things when they are cold. Thermometers take advantage of that to measure heat. The old-fashioned kind of [...]
Ice floats: A glass of ice water A project with ice To see that ice takes up more room than water does, stick a piece of tape to a glass [...]
