Comets

Comets are spectacular celestial bodies orbiting the Sun.

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Geographic coordinate system (basic)

The system of circles of latitude and longitude on the globe enable every location on the...

Structure of Earth (elementary)

The Earth is composed of several spherical layers.

Saturn

Saturn is the second largest planet in the Solar System, easily recognisable by its rings.

The Solar System; planetary orbits

The orbits of the 8 planets in our Solar System are elliptical.

Relief map of China

An introduction to the relief and hydrography of China.

Pluto - Charon system

The largest satellite of Pluto is Charon.

Salt Production

The evaporation of seawater provides an excellent opportunity for coastal countries to produce salt.

Structure of the Earth (intermediate)

The Earth is composed of several spherical layers.

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