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Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

Inca warrior (15th century)

The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.

System of public utilities

System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.

The history of human migration

The migration of large human populations began in Ancient times.

Milky Way

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

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

Air pollution

This animation demonstrates the main sources of air pollution: agriculture, industry and urban settlements.

Traditional Eskimo lifestyle

Igloos were the typical dwellings built by Eskimos living in the Arctic zone.

Comparison of real fruits and pseudofruits

The pericarp of real fruits develops from the carpel, while the pericarp of pseudofruits develops from other parts of flowers.

Medieval Chinese Emperor

The Emperor of the vast Far-Eastern empire was the lord of life and death.

Homo erectus

The ‘upright man’ used tools and could set fire.

Observatory

Observatories are often built at high elevations to minimise the effects of atmospheric turbulence

Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Common earthworm

The anatomy of annelids is demonstrated through the example of the common earthworm.

Types of synovial joints

Synovial joints can be categorised by the direction of movement they allow.

Mid-latitude cyclone and anticyclone

Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.

Warm front, cold front

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

Underground waters

Groundwater and aquifers are types of underground waters.

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

Native American settlement (Crow Nation)

The Crow are Native Americans who inhabited the Yellowstone River valley.

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