The Grand Canyon. It’s vast. So big you can’t imagine it until you’re standing at the edge of one of the rocky red cliffs, looking down. It’s not only deep, though, it’s wide, so wide you can’t see the other side. And long, too, like three hundred miles or something. There’s a river that snakes through the bottom, and incredible rock formations everywhere, and in the canyon walls, individual sedimentary layers where nearly two billion years of Earth’s history are exposed. It’s been inhabited by Native Americans for thousands of years, and many of the tribes consider it a holy site. Because it
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