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.

The Cave of Altamira

The world-famous limestone cave with its amazing cave paintings is one of the most important archaeological sites of Palaeolithic art.

Attack of Pearl Harbor (1941)

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

How does it work? – Tower crane

Tower cranes are machines used for lifting loads weighing up to several tonnes.

Dividing Space into Regions by 3 Planes

Division of space by three intersecting planes in several different arrangements.

Traditional Arab sailboat (Sambuk)

The largest type of Arab sailboat, most commonly used as trading vessels in the Persian Gulf.

Volume of a tetrahedron

To calculate the volume of a tetrahedron we start by calculating the volume of a prism.

Oil platform

A long pipe in the centre of the tower penetrates the ocean bed until it reaches the layer that contains oil.

Ancient Greek pottery

The masterpieces of ancient Greek potters are important archaeological artefacts.

Dice

Regular dice can be used for solving statistical and probability exercises.

The withdrawal reflex

The withdrawal reflex is a spinal reflex that ensures moving away from potentially damaging stimuli.

Hot air balloon

A hot air balloon is a balloon aircraft which is lifted by hot air.

Water turbine, generator

Water turbines convert the kinetic energy of water into electric current.

How does it work? – Cinema projector

This animation demonstrates the design and operation of a traditional cinema projector.

Location of origin of livestock and crops

Domesticated animals and crops originate from various parts of the world.

Soil pollution

This animation demonstrates the main sources of soil pollution.

Tardigrade

Tardigrades can survive in extreme environments, they can even stay alive in outer space.

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