The term for a geographic locations high above sea level is?

If we review the changes in the landscape surrounding the great salt lake in utah we can see a change in topography. look at the area to the south of the lake. what change has occurred during the last twenty-nine years? a) erosion of the hills b) an increase in marshland c) flooding of the area and the development of wetlands d) deposition of sediments and an increase in elevation

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine

Can you give an explanation of what medc and ledc are.