Carbonate ion (CO₃²⁻)

A compound ion produced from carbonic acid by releasing protons.

Art Nouveau architecture

One of the most beautiful Art Nouveau buildings in Hungary.

Modern office building

Saving energy and protecting the environment are important factors in the design of modern office buildings.

Suction pumps and direct action pumps

Direct action pumps and suction pumps are among the simplest water pumps.

How do fish breathe?

Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.

Nitrogen (N₂) (intermediate)

A colourless, odourless, non-reactive gas, it constitutes 78.1% of Earth´s atmosphere.

Treasury of Atreus (Mycenae, 14th century BC)

A beehive tomb on the site of the ancient city of Mycenae, attributed to the legendary king.

Alesia (France, 1st century BC)

The Gaul city Alesia, defended by Vercingetorix, was besieged by the Roman forces of Julius Caesar in 52 BC.

Ichthyostega

A prehistoric amphibian and an early representative of the Tetrapods, which became extinct 360 million years ago.

Katie on the playground

A colourful and entertaining animation to practise orientation in space.

Slavic warriors

Slavic warriors were greatly respected throughout Europe in the Middle Ages.

Villages

Villages were the first permanent human settlements

Human evolution

The brain and skull underwent significant changes during human evolution.

Carbon dioxide (CO₂) (intermediate)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Diamond

Crystalline allotrope of elemental carbon, the hardest known natural substance.

Western jackdaw

Groups of western jackdaws are frequently found in cities. Konrad Lorenz analysed the complex social behaviour of these animals.

Shadows

Change of light conditions in different seasons. Measuring height using shadows.

Photosynthesis (basic)

Plants are capable of converting inorganic substances (carbon dioxide and water) into organic sugar.

Saker falcon

The saker falcon is a large bird of prey widespread in Europe and and Asia.

Graphite

One of the crystalline allotropes of elemental carbon.

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