The Gregorian calendar

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

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A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

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Earthquake

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Milky Way

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Glacier (basic)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.

The River System of the Amazon

A Föld legbővizűbb folyama, az Amazonas és vízgyűjtő területének a bemutatása.

Geyser

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

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