#3135: Sea Level
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[Single frame, with Megan and Cueball standing at a coastline, with water and waves visible.]
Cueball: Hey, where's that big island we were looking at this morning?
Megan: Oh, it's underwater. The ocean's depth here goes up and down by like ten feet every day.
Cueball: What?
Megan: It's because the planet has a big moon orbiting near the surface. It causes weird gravity effects.
Cueball: What???
[Caption below the frame:]
People here are used to them, but tides are one of the weirdest and most sci-fi elements of life on Earth.
(Sourced from explainxkcd.com)
Title text:They're up there with coral islands, lightning, and caterpillars turning into butterflies.