The Earth’s crust is divided into 17 huge plates called tectonic plates. Tectonic plates are in constant ...
A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth.
Glacier cover more than one tenth of the Earth’s surface. Glaciers are enormous masses of compressed ice....
A valley is a thin basin situated between the bases of mountains. Valleys are formed by ....
Fascinating facts about our world
