The taiga

Among the climate zones with the greatest extremes, the taiga only formed in the Northern hemisphere. The scenery is breathtaking, and the population is scarce.

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Why is seawater salty?

Water covers about 71% of the Earth’s surface. But why are there...

How does soil form?

This lesson presents soil formation, the components of soil, and...

Solar eclipse and lunar eclipse

We can observe quite interesting astronomical phenomena when the...

The Tundra: a green-edged icy wasteland

Is the tundra region as cold and deserted as many people think?


It is a sedimentary rock made up of loosely structured, rough...


Rocks are a composed of minerals. These minerals can often be...

Snow line

Above a certain altitude snow does not melt, not even in summer.

The formation of fog

Fog is a type of cloud that forms close to the surface of the...

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