<Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (November 2015) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (November 2015) </Td> </Tr> <P> Mountain ranges are known to take many millions of years to erode to the degree they effectively cease to exist . Scholars Pitman and Golovchenko estimate that it takes probably more than 450 million years to erode a mountain mass similar to the Himalaya into an almost - flat peneplain if there are no major sea - level changes . Erosion of mountains massifs can create a pattern of equally high summits called summit accordance . It has been argued that extension during post-orogenic collapse is a more effective mechanism of lowering the height of orogenic mountains than erosion . </P> <P> Examples of heavily eroded mountain ranges include the Timanides of Northern Russia . Erosion of this orogen has produced sediments that are now found in the East European Platform, including the Cambrian Sablya Formation near Lake Ladoga . Studies of these sediments indicate that it is likely that the erosion of the orogen began in the Cambrian and then intensified in the Ordovician . </P>

Define erosion and identify the different agents of erosion