Greenhouse effect

Human activity increases the greenhouse effect and leads to global warming.

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Let's watch the auroras!

Let's find out interesting facts about the flora and fauna of polar regions and the...


Icebergs are blocks of frozen freshwater floating in the sea.

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

From the Sahara to Amazonia

Sahara sand carries nutrients essential for the Amazonian flora.

The process of physical and chemical weathering

Upon physical weathering the rock only falls into pieces, whereas during chemical weathering its...


It is a sedimentary rock made up of loosely structured, rough grains of rock.

Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw materials today.

Rivers and landforms

Rivers play an important role in shaping the Earth's surface: they cause erosion as well...

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