The desert

One third of the continents is covered with desert. Today, desertification is a growing problem.

Related extras


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

The rock cycle

Due to the effect of both exogenic and endogenic forces, rocks constantly change. This...

The soil

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

Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw...

Abrasion coasts

The destructive force of waves can create steep cliffs in certain coastal areas. Let’s...

Protecting natural waters

Water is one of our key natural resources; we must protect it vigorously.

Glacier (intermediate)

A glacier is a large body of ice that forms from snow, and is in constant, slow motion.


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

Added to your cart.