The Grand Canyon by Numbers

Here are ten figures related to the Grand Canyon.

1.  3 - 6 million -- number of years ago that it took for the Colorado River to carve out the Grand Canyon

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2.  2 billion -- age of rocks

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3.  18 -- width in miles of canyon (the island of Manhattan can fit inside)

4.  3 -- number of Empire State Buildings which can be stacked on top of each other to equal canyon's height

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5.  11,000 -- number of years since humans first settled in the canyon

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6.  1919 -- year the canyon achieved state park status

nationalgeographic.com

7.  45,000 -- number of visitors when it first opened

Theodore Roosevelt with tourists at the Canyon courtesy www.pbs.org.

8.  56 -- number of reptiles living in the Grand Canyon

www.grandcanyontreks.org

9.  355 -- number of species of birds;

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10.  3 -- types of rock (Layered Paleozoic, Grand Canyon Supergroup, Vishnu Basement)

answersingenesis.org

Source:  www.history.com