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

Related extras


Within the lethal embrace of deserts, life can only flourish because of large springs. Here...

Continental drift

In the past, a number of geologists tried to explain why the outlines of continents seem to fit...

Weather fronts

When masses of cold and warm air meet, weather fronts develop.


It is a sedimentary rock with high calcium carbonate content.

Coal formation

This video presents the different stages of coal formation.

Deep Sea Hydrothermal Vents

A hydrothermal vent is a fissure in the planet's surface from which geothermally heated...

Cloud formation

When the temperature of the cooling air reaches dew point condensation occurs because air is...

Local winds

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

Added to your cart.