You are out camping in a remote area. The next day, you plan to hike the mountain trail and return to camp before dusk. Your friends suggest that after hiking, you might want to enjoy a warm shower. They suggest that before you head out in the morning, you should suspend a strong, black cloth bag full of about 5 gallons of water, so that it sits in sunshine all day. When you return, the water should be warm, and you can enjoy a luxury because of good planning. It works and you are delighted and refreshed! The process that you used to get a warm shower illustrates
A) passive solar heating.
B) active solar heating.
C) solar space heating.
D) flat-plate collection
Answer: A) passive solar heating.
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