Học tại trường Chưa có thông tin
Đến từ Chưa có thông tin , Chưa có thông tin
Số lượng câu hỏi 8
Số lượng câu trả lời 56
Điểm GP 0
Điểm SP 40

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michi eru

 The search for afternative resources of energry has resulted in various directions . Many communities are burning garbage and other biological waste products to produce electricity . Changing waste into gases or oil is also efficient way to dispose of waste .Experimental work being done to make synthetic fuels from coal , or coal tars . But to date that process has proved expensive . Other experiments are underway to harness power with gaint windmills . Geothermal power heat from the earth is also being tested . 

  Some experts are trying to revive hydroelectric power which is derived from streams and river . Fifty years ago , hydoelectric power provided one third of electricity used in the United States , but today it supplies only four percent . The oceans are another source of energy . Scientists are studying ways the change the energy of ocean currents tides , and warves into electricity . Experiment are also underway to make use of temperature diferences in ocean water to produce energy .

1. What are many communities doing to produce electricity ?

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2.Has the process of making synthetic puels from coal or coal tars proved cheap?

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3. where is hydoelectricity power derived from ?

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4. what percentage of the electricity used in the USA does hydoelectric power provide today ?

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5. Are warves from the oceans used to make electricity ?

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michi eru
michi eru