In the 1930s, new farming methods .a. increased the ownership of farms. b. prevented topsoil from blowing away. c. prevent droughts. d. made drought conditions worse

The answer is letter C. It helped prevented droughts 

The government was able to come up a certain way in order to prevent another Dust Bowl to occur in the US. They were able to introduce crop rotation and irrigation and soil tillage. These new farming Methods were introduce under the New Deal. The New Deal program was one of the program being implemented by the US government during the Great Depression

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust.