or log in
Karst formations include dolines and dripstones.
Is the tundra region as cold and deserted as many people think?
Atmospherical nitrogen is bound by bacteria and used by living organisms in the form of various...
The difference between the temperature of the polar and equatorial zones causes atmospheric...
Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is the most...
Physical properties, as well as the flora and fauna of the ocean change with depth.
This animation demonstrates different types of soil.
It is characterised by dry, hot summers and mild winters.