Generating alternating current

Electric current can be generated by rotating an armature loop in a magnetic field.

Chlorophyll

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

Water supply system

The water supply system provides clean and safe drinking water for the consumers.

Attack of Pearl Harbor (1941)

The United States entered World War II after the devastating attack by the Japanese navy.

Types of soil (soil profiles)

This animation demonstrates different types of soil.

Archaeopteryx

The archaeopteryx shows characteristics of both birds and reptiles. It is probably the ancestor of birds.

Bells

The bell is a percussion instrument and an idiophone. Many types of bells exist.

Southern plantation with slaves (USA, 19th century)

Before the American Civil war the use of slaves on plantations was typical in the Southern states.

Underground coal mining

As opposed to opencast mines, in underground mines the layers covering coal are not removed, coal is extracted from mine shafts.

Industrial estate

Industrial estates provide infrastructure and services for companies.

Oasis

Oases are areas in deserts where water is available.

Mid-latitude cyclone and anticyclone

Cyclones are large areas of circulating air with clouds and precipitation being formed in its centre.

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

Underground waters

Groundwater and aquifers are types of underground waters.

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

Native American settlement (Crow Nation)

The Crow are Native Americans who inhabited the Yellowstone River valley.

Ammonites

An extinct group of Cephalopoda, with solid external skeletons. They are excellent index fossils.

Platypus

A mammal with features typical of reptiles: it lays eggs and has a cloaca.

Piano

The piano is one of the most popular instruments in the world. It is a chordophone which produces sounds mechanically.

Weightlessness

A spacecraft on its path is in a constant state of free fall.

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