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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Karst region (intermediate)

Karst formations include dolines and dripstones.

Limestone

It is a sedimentary rock with high calcium carbonate content.

Earthquake

An earthquake is one of the most devastating natural phenomena.

Formation of stratovolcanoes

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

Ocean currents

The Great ocean conveyor is a planet-wide system of ocean currents, which has a great...

Volcanic activity

The area surrounding an inactive or extinct volcano is not necessarily calm. Let’s see the...

The process of physical and chemical weathering

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

Polluting natural waters

Water is one of our key natural resources; we must protect it vigorously.

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