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A phase transition is the change of a substance from one state of matter to another.
This animation shows the electron configuration of the calcium atom.
The 'Temple of all gods' was built during the reign of the Roman Emperor Hadrian.
Carbon is bound in organic substances during photosynthesis, while during breathing, it is released into the atmosphere.
Learning about the geographic location, capitals and flags of the world´s countries through exercises in three levels of difficulty.
Cyclones are large air masses with winds spiralling inwards around a low-pressure centre, and carry clouds and precipitation.
Human activity increases the greenhouse effect and leads to global warming.
The ozone layer filters the Sun's harmful UV radiation, therefore it is indispensable for life on Earth.
The Earth’s magnetic North and South poles are located near the geographic North and South poles.
Stratovolcanoes consist of layers of volcanic ash, debris and lava.
Major phases in the history of theories and views about the structure of the atom.
Space probes and Mars rovers examine the structure of Mars and possible traces of life.
Neil Armstrong, one of the crew members of Apollo 11 was the first man to set foot on the Moon.
The steam engine, perfected by the Scottish engineer James Watt, revolutionised technology.
The most famous and most magnificent amphitheatre of Rome was built in the 1st century.
The magnificent bath complex of the Roman Emperor was built in the 3rd century AD.
The French Montgolfier brothers were the first pioneers of flying.
Energy released during nuclear fission can be used for civilian or military purposes.
In benzene there are sigma bonds and delocalised pi bonds between carbon atoms.
Our body's internal support structure to which skeletal muscles are attached.
Skeletal muscles form the active part of the locomotor system: they move the bones they are attached to.
Yuri Gagarin became the first human in space on 12 April 1961.
African villages adapt to the natural environment well and reflect of the culture of local tribes.