With a jump off the edge of a boat, deep sea divers enter another world. There is much to explore, since oceans cover more than 70 percent of Earth’s surface. Many types of scientists study the oceans. There are also people who dive to do their jobs underwater—or dive just for fun. These people all use math before, during, and after their dives.
Since the world’s oceans are all connected, scientists often talk about “the ocean” (meaning all of them). They divide the ocean into “zones,” or levels, depending on how deep the water is. Water pressure increases as the ocean gets deeper. Divers need different equipment to handle the pressure at different depths.
