The Gregorian calendar

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

Related extras

The formation of fog

Fog is a type of cloud that forms close to the surface of the Earth. There are places on the...

Volcanic activity

The area surrounding an inactive or extinct volcano is not necessarily calm. Let’s see the...

Karstification

The dissolution of limestone results in the development of karst formations.

Sedimentary rock

Did you know that about 75% of the land on our planet is covered with sedimentary rock?

Folding (intermediate)

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

Loess

It is a sedimentary rock made up of loosely structured, rough grains of rock.

The atmosphere

The atmosphere surrounds us everywhere on this planet. We take its presence so much for granted...

The subtropics

The subtropics are located between the tropical and temperate zones, between 23.5° and 40°...

Added to your cart.