A severe thunderstorm, known as a supercell, forms. It begins in an area where cold, dry, polar air meets warm, moist, tropical air, and the atmosphere is unstable. The wind coming into this storm begins to swirl, creating a swirling area of very low pressure. Which of the following is likely to occur in these conditions? A. lightning

B. hurricane

C. cold front

D. tornado

Tornadoes that come from a supercell thunderstorm are the most common so the answer would be

D) tornado

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.