Cloud formation

When the temperature of the cooling air reaches dew point condensation occurs because air is unable to hold more water.

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Bauxite is a raw material in aluminium production. Watch this video to learn how the well-known...

Aeolian landforms in deserts

Wind, as an external force, plays an important role in shaping deserts.

Faulting (intermediate)

Vertical forces can break up layers of rock into fault blocks, which then move vertically along...

Loess

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

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...

Glaciation

The last Ice Age ended about 13 thousand years ago.

Solar eclipse and lunar eclipse

We can observe quite interesting astronomical phenomena when the Earth, the Sun and the Moon align.

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion...

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