Hungarian army in the 15th century (infantry)

One of the main units of Matthias Corvinus´ Black Army was the infantry.

Silver bromide (AgBr)

A white, crystalline compound which breaks down when exposed to light.

Historical topography (places)

Find notable historical places on a blank map.

2-methylbutane (C₅H₁₂)

One of the isomers of pentane, used as a solvent.

Silicon

A crystalline substance, an extremely important material in the electronics industry ...

Female reproductive system (basic)

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

Construction of a panel building

Buildings constructed of prefabricated concrete blocks were widespread in the former...

Historical topography (battles, Hungarian history)

Place the sites of notable battles in Hungarian history on a blank map.

Carbon dioxide (CO₂) (beginner)

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

Carbon monoxide (CO) (beginner)

Colourless, odourless gas, highly toxic to humans and animals in high concentration.

Nitrogen (N₂) (basic)

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

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the atmosphere, indispensable to...

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