including
a descent and re-ascent of
the
Bright Angel Trail
from
South Rim to the Colorado River
The
Grand Canyon is a colourful, steep-sided gorge
carved by the Colorado
River in the U.S. state of Arizona.
It is largely contained within the
Grand Canyon National Park.
The canyon, created by the
Colorado
River over 6 million years,
is 277 miles ( 446 km ) long,
ranges in width
from 4 to 18 miles ( 6.4 to 24 kilometers ),
and attains a depth of more
than a mile ( 1.6 km ).
Nearly two billion years of the Earth's history
have been exposed as the Colorado River
and its tributaries cut their
channels
through layer after layer of rock
while the Colorado Plateau
was uplifted.
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