Deep Sea Hydrothermal Vents

A hydrothermal vent is a fissure in the planet's surface from which geothermally heated water erupts.

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Layers of the ocean

Physical properties, as well as the flora and fauna of the ocean change with depth.

Glaciation

The last Ice Age ended about 13 thousand years ago.

The formation of fog

Fog is a type of cloud that forms close to the surface of the Earth. There are places on the...

Limestone

It is a sedimentary rock with high calcium carbonate content.

Tropical cyclones

Cyclones are large areas of swirling air with clouds and precipitation being formed inside.

Exogenic forces

The surface of the Earth has been formed into its present state both by external and internal...

The Gregorian calendar

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

Eratosthenes

The circumference of the Earth has already been calculated in ancient Egypt. The calculations...

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