21. Section Check 3 Question 1 How much of Earth’s water is available for human consumption? A. 97% B. 70% C. 3% D. less than 1% NC: 3.02
22. Section Check 3 Answer The correct answer is D. Freshwater that is available for humans is found in lakes, streams, rivers, and as ground water. NC: 3.02
23. Section Check 3 Question 2 Explain how water from a lake or stream can be recycled into the water cycle . NC: 3.02
24. Section Check 3 Answer Water in a lake or stream evaporates when the Sun’s energy changes it into water vapor. Water vapor condenses in the atmosphere and falls back to Earth as precipitation. The precipitation soaks through Earth’s surface or forms runoff and eventually returns to the lake, stream, or ocean. NC: 3.02
25. Section Check 3 Question 3 What is groundwater? Answer Groundwater is water that is held underground in layers of rock and sediment. NC: 3.02
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