3. Focus Reading Skill Practice-Main Idea and Details Skill Read the selection. Underline the main idea. List at least three details about the main idea. Scuba diving is a great way to explore the ocean-if you do it safely. Pressure is a big concern for divers. As you go deeper, pressure on your body increases. Divers learn to breathe from a high-pressure air tank. A painful illness sometimes called the bends results from drastic pressure changes. All divers learn about pressure in safety classes.

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