Protecting natural waters

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

Related extras

Mountain climate zones

The decisive factor that determines the climate zones of mountains is the altitude...

Local winds

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

Folding (advanced)

Lateral compressive forces cause rocks to form folds. This is how fold mountains are...

The development of lakes

Standing bodies of water can form in depressions on the surface by both endogenic and...

Lightning

A lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is...

Why is seawater salty?

Water covers about 71% of the Earth’s surface. But why are there two types of water on...

The African savannah

The largest contiguous savannah in the world is in Africa. It covers about one-third...

Added to your cart.