Waterfalls form where the river flows over a steep precipice in its course.

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El Niño

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

The soil

Soil is the loose, uppermost, fertile layer of the Earth’s crust.

Cloud formation, types of clouds

Evaporating surface water forms clouds of various shapes from which water falls back to the...

Solar eclipse and lunar eclipse

We can observe quite interesting astronomical phenomena when the Earth, the Sun and the Moon align.

Local winds

The most important types of local winds are the sea-land breeze, the mountain-valley breeze as...

Oxygen cycle

The oxygen cycle describes the movement of oxygen within its three main reservoirs.

Ocean currents

The Great ocean conveyor is a planet-wide system of ocean currents, which has a great influence...

Layers of the ocean

Physical properties, as well as the flora and fauna of the ocean change with depth.

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