Beach Reading

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Beach Reading

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Here’s a great story to read on the beach, but it’s not on your summer book list. Every beach is a mystery. Read the clues right and they’ll tell you about the area’s ocean floor, sea life, and geology. You can start with the usual suspects: waves. They make or break a beach. Gentle slopes and slow-rolling waves produce wide beaches and shallow, sand-rich bottoms extending way off shore. Steep slopes and tall, angular waves that crash hard rob the beach of sand, keeping it narrow and rocky. Now scoop up some sand for a closer look. Fine, rounded grains that look mostly alike mean the beach is made of rocks and minerals from far away, broken down over long time frames as they traveled in rivers or ocean currents. Pebbly, angular sand grains with lots of diversity come from nearby coastal headlands or fast-moving rivers. White sand could be quartz, or limestone from nearby cliffs, or ground-up seashells, suggesting an ocean healthy with mollusks and snails. Pink sand could be ground-up coral, indicating offshore reefs Black sand is made of obsidian or basalt, like on some beaches in Spain. Green beaches mean volcanic rocks are eroding, concentrating olivine in the sand, as you can find in Hawaii. With a keen eye, there’s a great deal to uncover on the beach. For more clues, visit EarthDate.org.

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