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REVIEW PAGE - UNIT 15 Key Words: surveying, total station, tripod, prism, level, rod, elevation, GPS, satellite, receiver. Exercise: Answer the questions. What tool sends a laser beam to measure distance? (Answer: total station) What does a level measure? (Answer: height/elevation) What does GPS stand for? (Answer: Global Positioning System) UNIT 16: GREEN BUILDING AND SUSTAINABILITY Page 77 INTRODUCTION Buildings use a lot of energy. They also create waste. Green building is about makin