05 地球上为什么会有沙漠?Why Does Earth Have Deserts

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Look at the earthisn't it beautiful?

Blue oceans, white polar ice-caps, and verdant green land.

Some brown as well, where there aren't as many plants.

But why are those parts of our earth barren, and others green?

I mean, deserts cover much of Africa and Australia, but not Europe!

Europeans, it turns out, discovered the answer, but in the most unlikely of placesthe oceans!

When sailing from Europe, trade winds pushed ships enthusiastically southwest to the equator, where suddenly, the winds would die.

These were the doldrums.

And for sailors, they were a pain.

They were also annoying to scientists like Galileo, Kepler, and Halley, who all had theories about why the wind blew to the southwest: Did the wind somehow follow the sun from morning till night?

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