If people do not have good cave maps, they won't know where sink holes are developing. Because of this, many houses, roads, animals, and farmlands have fallen into sink holes. Cavers can use climbing equipment to get in or out of shafts. Maps will also keep people from falling into shafts in caves. Ask students to identify dangers to caves.
Pollution can come from houses, from factories, and from roads.
Pollution from garbage can harm cave animals. Ask the students what they would change about the drawing if they were in charge of where to build factories, houses, and roads. Write a paragraph describing how rainwater gets into a wet cave. Explain how bat sonar works.