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.
Only cars purchased through May get the government-backed warranty. GM will continue to make parts for Pontiac models indefinitely and most Pontiac dealers also sell the Buick and GMC brands and will continue to operate. The automaker still produces replacement parts for the defunct Oldsmobile, which GM shuttered in 2004. What Hopson couldnât say was when certain models would be phased out. The current Pontiac lineup reads as follows, including how many days of inventory was sitting on lots as of April 1.