Formation of stratovolcanoes

Stratovolcanoes consist of layers of volcanic ash, debris and lava.

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The World of the seas

Seas and oceans cover almost three-quarters of the Earth’s surface. 97.5% of the total...

Weather and climate

Climate is the typical weather of a certain region that changes practically only on a geological...

Folding (intermediate)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.

Eratosthenes

The circumference of the Earth has already been calculated in ancient Egypt. The calculations...

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

The African savannah

The largest contiguous savannah in the world is in Africa. It covers about one-third of the...

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

Solar eclipse and lunar eclipse

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

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