Another theory is that the mantle flows neither in cells nor large plumes but rather as a series of channels just below the Earth's crust, which then provide basal friction to the lithosphere. This theory, called surge tectonics, became quite popular in geophysics and geodynamics during the 1980s and 1990s.
General Motors to discontinue Chevrolet Tavera, Sail and Enjoy in India. According to a report in ET Auto, General Motors is planning to discontinue the production and sale of three Chevrolet products, Tavera, Sail and Enjoy in order to make way for newer products that the company plans to launch in the coming months.
April 27, 2009. Today GM announced it would stop producing new Pontiac models by the end of 2010. This is the end of an era for the once-proud performance brand, but it also leaves a lot of questions for car shoppers and Pontiac owners. We talked to Jim Hopson, Pontiacâs manager of communications, this morning to clarify GMâs statement.