Questions
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Questions 31-35
Complete the notes below.
Write ONE WORD ONLY for each answer.
Hydropower
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Renewable—constant source of 31 from natural hydrologic cycle
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32 —90% of hydro energy → electricity
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Clean—no air or 33 pollution
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34 & durable—simple to operate
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Flexible—can start & adapt quickly to meet demand → leads to 35 of power supply
Questions 36-38
Label the diagram below.
Write no more than TWO WORDS for each answer.

36. 36
37. 37
38. 38
Questions 39 and 40
Complete the sentences below.
Write NO MORE THAN TWO WORDS for each answer.
39. To be effective, hydroelectric dams should be built across rivers with both sufficient head and 39.
40. There needs to be a balance between the needs of 40 living in developed environments and the preservation of natural habitat.