Soil factsGeography quiz
Why is White Sands Desert in New Mexico so purely white?
It is gypsum. White Sands, having 442 total square kilometers of dune fields, is the world's largest surface deposit of gypsum. Unlike other desert sands, it is cool to the touch, due to the high rate of evaporation of surface moisture and the fact that the sands reflect, rather than absorb, the sun's rays.
What is the maximum depth of permafrost?
1500 m. In areas of harsh winters the depth of the permafrost can be as much as 1,493 m (4,898 ft) in the northern Lena and Yana River basins. The overlying active layer that seasonally thaws is just 0.6–4 m (2.0–13 ft) thick.
Which European country has the most fertile land?
Ukraine. Chernozem (pictured, literally black earth) is a soil containing a high percentage of humus. It is very fertile and produces a high agricultural yield. Chernozem occurs in many places in the world, but it is the most common and the deepest in Ukraine. Throughout its history, Ukraine has been one of the powerhouses of world agriculture due to its fertile conditions.