Now, in turn, the opinion polls are signalling a new and deep erosion in immigrant support for Mr Barak.

ECONOMIST: Israel��s great divide

However the central plateau (1, 000 meters of altitude) and the formation of radial and deep ravines is the result of intense erosion.

UNESCO: EDUCATION

Gibeon meteorites that fell in Namibia thousands of years ago are smoother, refined by millennia of terrestrial erosion and often enhanced with a deep brown patina.

FORBES: Hot Rocks