After going through this module, you should be able to: 1. describe the possible causes of plate movement ($10ES-la-j-36.5); and 2. recognize the process of convection current in the mantle. What I Know Choose the letter of the best answer. Write your letter of choice on a separa of paper. 1. A convection current is caused by differences in temperature resulting to variation in A. air pressure B. color C. density D. mass