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Shadows are formed when an object blocks the path of light. Shadows on the Earth's surface are not completely dark, because the rays of light are scattered.

Sprouting radish

Let’s see how one of our favourite vegetables, the radish develops from seeds.

Growing wheat

Wheat is one of the fastest growing cereals. Let’s see how it develops.

Human settlements

People live in different types of settlements. As the population grows, the range of services available for the residents widens as well.

Urban renewal

Unused, old factory buildings are often revitalised by leaving their original structure but giving them completely new functions.


Villages are settlements with a small population, usually situated near towns. Their economic activity is less bustling compared to that of towns.


The buffalo is a much more powerful beast of burden than cattle, it can carry or draw much heavier loads.


This class in the animal kingdom has the highest number of species. More than half of all known animal species, (more than 1 million) belong here.


This species is an excellent example for symbiosis. Living together with sea anemones they keep predators away.


Dragonflies are aquatic in their larval stage. They are predator insects, easily recognisable by their two pairs of transparent wings.

Field horsetail

A perennial plant with a rhizomatous stem, the length of which may reach 2-3 m. The height of the plant above ground, however, is only 50-60 cm.


Zither is a plucked string instrument. Its variations are common in Scandinavia and the Far East.

Mountain climate zones

The decisive factor that determines the climate zones of mountains is the altitude above sea level.

The history of domestication

In this video we present why some of the well-known animal species were domesticated.

Suburban areas

Due to lower real estate prices, people and industry often move from big cities to suburban areas. This trend is called counter-urbanisation.

Model volcano

The reaction of baking soda and vinegar tinted with red food colouring resembles a volcanic reaction.

The process of physical and chemical weathering

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

The lion

King of the savannahs, the lion is at top of its food chain. Its only enemy is man.

Air transport

Air transport has become the fastest, most reliable and most popular form of travel.

Air transport

Air transport has become the fastest and most reliable way of travelling. Thanks to air transport, the pace of globalisation has accelerated significantly.

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