Tooth brushing

Careful tooth brushing is an important part of oral hygiene.

Arab warrior (6th century)

The most important weapons of medieval Arab warriors were the bow and the sword.

Observatory

Observatories are often built at high elevations to minimise the effects of atmospheric turbulence

Aztec ruler (15th century)

The Aztec Empire was a despotic, militaristic state ruled by the tlatoani.

Mongol Khan (13th century)

The ruler of the vast Mongol Empire was the Khan.

Ancient Egyptian sailing boat

The river and marine sailing boats of ancient Egypt were one-masted, oared boats

Airport

Airports provide infrastructure and services necessary for aviation.

Paramecium caudatum

Common ciliated eucaryotic unicellular organisms widespread in freshwaters.

Inca warrior (15th century)

The Incas´ rudimentary weapons were inadequate in their struggle against the Spanish Conquistadors.

European honeybee

Honeybees produce a sweet and nutritious substance, honey.

Turkish bath (16th century)

One of the positive influences of the Ottoman invasion of Europe was the construction of baths.

Maize

One of the most important monocot crops.

Viking chieftain (10th century)

Viking leaders were elected from tribe members by the right of blood or an act of bravery.

The phosphorus cycle

The phosphorus cycle describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

Fjord

A fjord is a long, narrow inlet with steep sides, created in a valley carved by glacial activity.

Glaciation

The last Ice Age ended about 13 thousand years ago.

Geyser

A geyser is a spring characterised by intermittent discharge of water and steam.

System of public utilities

System that satisfies consumers’ demands of water supply, wastewater disposal, electricity, heat and gas supply and telecommunication.

Chlorophyll

Chlorophyll is a photosensitive green pigment found in plants; it absorbs light energy, thus plays a vital role in photosynthesis.

The history of human migration

The migration of large human populations began in Ancient times.

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