The plateaus cover about 18% of the earth’s surface.
This land-form has a large elevated area on its top unlike a mountain and has nearly even surface out there.Very often rivers or streams cut out deep valleys and gorges in a plateau region. In place of its original smooth topography, it then changes into a dissected plateau. A plateau, however remains much higher above the sea level of the nearby areas. Though normally 600 metres above sea level, there are plateau of Tibet and Bolivia, more than 3600 metres above sea level.
A plateau is an elevated area of more or less level land on its top. It has a large area on its top and steep slope on its side.
Bibliography : NIOS Geography Book