We know so little about the structure of the Earth. For example, our planet is not fully spherical, as it slightly flattens when rotating. Therefore, its equatorial diameter (12.754 km) is 43 km larger than the polar one (12.711 km). Our planet is the den...

It is the largest and most famous desert on Earth. Only Antarctica is bigger, but we do not think of an ice-covered continent as a desert in the typical sense. Most people associate a desert with the scorching sun, lack of rain, and sand, lots of sand. O...