Lightning

Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.

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Limestone

It is a sedimentary rock with high calcium carbonate content.

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...

The Baikal fault line

The deepest lake in Earth was formed in a rift valley created by the Baikal Rift Zone.

Karst region (basic)

Karst formations include dolines and dripstones.

The Jovian planets

The four outer planets (Jupiter, Saturn, Uranus and Neptune) do not have solid surfaces, thus...

The path of bauxite

Bauxite is a raw material in aluminium production. Watch this video to learn how the well-known...

Icebergs

Icebergs are blocks of frozen freshwater floating in the sea.

The work of glaciers

A glacier is a large body of ice in constant, slow motion down a hillside.

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