Due to the Earth´s tilted axis, the angle of the Sun's rays at given latitudes continuously changes during the year.
The geographic coordinate system enables every location on the Earth to be exactly specified.
The difference between the temperature of the polar and equatorial zones causes atmospheric circulation which is affected by a number of factors, including...
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
The ozone layer filters the Sun´s harmful UV radiation, therefore it is indispensable for life on Earth.
The Troll A is an offshore natural gas platform, the largest offshore platform ever built: it rises about 170 metres above water level, weighs 656,000...
Dry land on the surface of Earth is divided into continents which are separated by oceans.
This animation demonstrates the development of the human embryo and foetus.
Water on Earth is in a continuous state of change. The water cycle includes processes such as evaporation, precipitation, melting and freezing.
Vertical forces can break up layers of rock into fault blocks, which then move vertically along the fracture planes.
Tectonic plates can move in relation to each other.
Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.
The rise and drop of sea levels caused by the gravitational force of the Moon.
Carbon is bound in organic substances during photosynthesis, while during breathing, it is released into the atmosphere.
Typical settlements of the Norsemen were not only established in Scandinavia, they appeared on distant areas as well.
The step pyramid, built in the 27th century BC, was the first pyramid in Egypt.
Soviet labour camps (Gulags) were located far from inhabited areas.
The magnificent capital of the Aztec Empire astonished even the Spanish Conquistadors.
When the Sun, Earth, and the Moon are arranged in a straight line, the Moon can partially or completely obscure the Sun.
Lunar eclipses occur when the Moon passes through the shadow cone of Earth