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Chapter 20: 20.1 Describe how the hydrologic cycle moves many elements through ecosystems Example question: Which of the following reasons best explains why logging of forests often leads to increases in flooding? Example question: Which of the following is a consequence of removing water from aquifers for irrigation? 20.2 Explain why the carbon cycle is closely tied to the movement of energy Example question: Which of the following statements about modern day levels of carbon dioxide in the atmosphere is true? Example question: Which of the following best summarizes the rates of carbon dioxide flux during the formation and burning of fossil fuels? 20.3 lllustrate the ways in which nitrogen cycles through ecosystems in many different forms Example question: Match the definition to the proper nitrogen cycle process. Example question: Which of the following is NOT a normal consequence of nitrogen influx into ecosystems