Geography
Why do cyclones spin? How hurricanes form
Cyclones spin because the Earth spins. Air rushes in towards the low pressure at the centre of the storm, and the Coriolis effect bends it...
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Geography
Why is the Sahara desert so dry? Hadley cells explained
The Sahara is so dry because it sits under sinking air. Near the equator (the middle of the Earth), strong sunshine heats the air, so it r...
Geography
How to Read a Climate Graph: Weather vs Climate
To read a climate graph, read the axes first. The months run along the bottom, the bars show rainfall in millimetres (mm) on one vertical ...
Geography
How Are Earthquakes Measured? Why M8 Isn't Twice M4
Earthquakes are measured with seismometers, instruments that record the ground shaking as a wiggly line called a seismogram. From those re...