Hydroelectric power plant (Hoover Dam, USA)

The huge dam built on the Colorado river in the US was named after a former American President.

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Types of farms and villages

The structure and density of farms and villages depend on the geographical features of...

Mars Exploration Program

Space probes and Mars rovers examine the structure of Mars and possible traces of life.

The distribution of food on Earth

Much more food is produced on Earth than is required to feed the population. While most people...

Operation of river locks

River locks make rivers with great level differences safe for boating.

Rolling roads

The rolling highway (Rollende Landstrasse) is an environmental friendly way of transport where...

Passive house

In a passive house a comfortable inner temperature can be ensured without the use of...

Basketball arena

Basketball is one of the most popular team sports.

Satellite navigation, GPS

The Global Positioning System consists of 24 satellites but only 4 have to be visible for...

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