Geyser

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

The history of human migration

The migration of large human populations began in Ancient times.

Fjord

A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.

Arab warrior (6th century)

The most important weapons of medieval Arab warriors were the bow and the sword.

Typical dwelling types

Every era and every culture has specific residential buildings.

Jameh Mosque (Isfahan, 15th century)

Its architectural solutions and ornamentation rank this mosque among the masterpieces of Islamic art.

Turkish bath (16th century)

One of the positive influences of the Ottoman invasion of Europe was the construction of baths.

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.

ADP, ATP

ATP is the main source of energy for cells.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.

Knee joint

The knee joint is made up by the femur, the tibia and the kneecap.

What is the time?

A game to practise the use of analogue and digital clocks.

NAD⁺, NADP⁺, NADPH

NAD⁺ is a coenzyme that plays an important role mainly in catabolic processes, while NADP is important in anabolic processes as hydrogen carriers.

Traditional Eskimo lifestyle

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

Aztec ruler (15th century)

The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.

Mongol Khan (13th century)

The ruler of the vast Mongol Empire was the Khan.

Female reproductive system (intermediate)

The reproductive system is a series of organs working together for the purpose of reproduction.

Blood vessels

The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.

Paramecium caudatum

Common ciliated eucaryotic unicellular organisms widespread in freshwaters.

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