Wind is a form of solar energy. Winds are caused by the uneven heating of the atmosphere by the sun. Wind flow patterns are changed by the earths terrain, bodies of water, and vegetative cover. This wind flow, or motion energy, when harvested by modern wind turbines, can be used to generate electricity. Wind turbines are available in a variety of sizes, and therefore power ratings. The largest machine has blades that span more than the length of a football field, stands 20 building stories high, and produces enough electricity to power 1,400 homes. A small home-sized wind machine has rotors between 8 and 25 feet in diameter and stands upwards of 30 feet, and can supply the power needs of an all-electric home or small business, utilityscale turbines range in size from 50 to 750 kilowatts. Single small turbines, below 50 kilowatts, are used for homes, telecommunications dishes, or water pumping. 49)Which of the following is NOT mentioned as a factor affecting the wind direction? A. earths terrain B. bodies of water C. vegetative cover D. the Sun 50)The word variety is closest in meaning with_________. A. capacity B. popularity C. diversity D. minority 51)What is the height of the largest wind turbines? A. as tall as a 20 story building B. between 8 and 25 feet C. 30 feet D. 50 feet giúp em với ạ!