Weather and climate

Climate is the typical weather of a certain region that changes practically only on a geological scale, whereas weather can change day by day.

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The process of physical and chemical weathering

Upon physical weathering the rock only falls into pieces, whereas during chemical weathering its...

Plate tectonics

Plate tectonics is a theory dealing with the movement of plates.

A Journey to the Centre of Earth

This lesson presents the internal structure of Earth, the geospheres and their general...

Where all water disappears - The Desert

Deserts cover nearly one-seventh of the Earth's land surface.

Karst region (intermediate)

Karst formations include dolines and dripstones.

Oxygen cycle

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

The Gregorian calendar

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

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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