tailieunhanh - Delta's key to the next generation toefl test part 40

Tham khảo tài liệu 'delta's key to the next generation toefl test part 40', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 42 Taking Notes Exercise Read the passage and then listen to the recording. To make this practice more like the real test cover the passage and question during the lecture. Listen for important information. Take notes about examples or reasons that will help you remember the key points. When you hear the question uncover the passage and question. Then allow 20 minutes to plan and write a response. Reading Time - 3 minutes Geothermal energy is derived from the heat contained within the earth. In some places the heat is so intense that it melts mantle rock to create liquid magma. Geologists believe that the ultimate source of geothermal energy is radioactive decay occurring deep within the planet. A renewable energy resource geothermal heat is produced primarily when water descends from the earth s surface and meets hot magma rising toward it. Some of this geothermal water circulates back up through faults and cracks in the earth s crust and reaches the surface as hot springs or geysers. However most geothermal water remains deep underground trapped in cracks and porous rock. In most regions of the world geothermal heat reaches the earth s surface in a very diffuse state having lost much of its energy potential. However in some areas including significant portions of western North America geothermal reservoirs exist close to the surface and are thus easily tapped for power generation. Geographic regions that possess well-developed geothermal systems are located in geologically active areas. Such favored regions with continuous concentrated heat flow to the surface include Iceland New Zealand. Japan and the Philippines. Tapping geothermal heat can generate electricity without harmful emissions. In geothermal power plants heat from the earth provides the physical force that spins turbine blades to generate electricity. Thus energy from the earth itself will likely play an important part in the renewable energy equation of the twenty-first century. Now cover the .