Well, it took about 17 million years for the Colorado River to cut the canyon out of the rock. And the rock layers show a mind-boggling 2 billion years of Earth's history.
* mind-boggling: something that is so large, old, or complex that it's hard to understand
ex> The most mind-boggling thing to me is trying to comprehend the universe as an endless space.
A couple of Native American tribes occupy parts of it. And the Hopi considered it hallowed ground and made pilgrimages here.
* hallowed ground: a sacred place; a burial site
ex> To many people, the National Cemetery is hallowed ground containing the soul of the nations' heroes.
Well, be happy we have a room at the Bright Angel Lodge tonight. We would freeze our butt's off tonight.
* v. + one's butt's off: to exert oneself at something
ex> The marketing team worked their butts off to make the new advertising campaign a success.
ex> It was so hot this summer that I sweated my butt off just walking to the bus stop.
I'm not that scared of heights, but I think this might give me palpitations.
* palpitations: irregular or pounding heartbeats
ex> The climb up to the top of the Status of Liberty gave the old man palpitations.
I thought you had nerves of steel? Don't be such a chicken.
* have nerves of steel: to be calm when faced with danger
ex> The key to being a successful athlete is to have nerves of steel when under pressure.
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