On Christmas Day, my family drove down the coast to Santa Monica to visit my parents. It was a beautiful day, and we had a great view of the Channel Islands. Arch Rock is the isolated rocky islet on the east end of Anacapa Island, about eleven miles off the coast. It has a huge sea cave going right through it, like a giant keyhole. Between Rincon and Ventura, we noticed that we could clearly see the keyhole whenever the highway climbed the hillside above the ocean. But the cave disappeared whenever the road dropped back to sea level. Explain!
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Marc Kummel / email@example.com