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One of the positive influences of the Ottoman invasion of Europe was the construction of baths.
The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.
Observatories are often built at high elevations to minimise the effects of atmospheric turbulence
The ruler of the vast Mongol Empire was the Khan.
The river and marine sailing boats of ancient Egypt were one-masted, oared boats
The capacity of data storage devices have increased at an incredible rate during the past decades.
The ‘upright man’ used tools and could set fire.
The most important weapons of medieval Arab warriors were the bow and the sword.
Igloos were the typical dwellings built by Eskimos living in the Arctic zone.
A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.
The last Ice Age ended about 13 thousand years ago.
A geyser is a spring characterised by intermittent discharge of water and steam.
One of the most important monocot crops.
Viking leaders were elected from tribe members by the right of blood or an act of bravery.
The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.
The migration of large human populations began in Ancient times.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
The water supply system provides clean and safe drinking water for the consumers.
Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.
The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.