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Nearly
two
billion
years
of
Earth's
geological
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.[6]
While
some
aspects
about
the
history
of
incision
of
the
canyon
are
debated
by
geologists,[7]
several
recent
studies
support
the
hypothesis
that
the
Colorado
River
established
its
course
through
the
area
about
5
to
6
million
years
ago.[1][8][9]
Since
that
time,
the
Colorado
River
has
driven
the
down-cutting
of
the
tributaries
and
retreat
of
the
cliffs,
simultaneously
deepening
and
widening
the
canyon.
https://en.wikipedia.org/wiki/Grand_Canyon
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Ansel Adams - Wikipedia
Ansel Easton Adams (February 20, 1902 – April 22, 1984) was an American landscape photographer and environmentalist known for his black-and-white images of the American West.
Adams helped found Group f/64, an association of photographers advocating "pure" photography that favored sharp focus and the use of the full tonal range of a photograph. With Fred Archer, he developed an exacting system of image-making called the Zone System, which described a method of achieving a desired final print throu... {open}
https://en.wikipedia.org/wiki/Ansel_Adams |
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Grand Canyon - Wikipedia
The Grand Canyon (Hopi: Ongtupqa;[2] Yavapai: Wi:kaʼi:la, Navajo: Bidááʼ Haʼaztʼiʼ Tsékooh,[3][4] Spanish: Gran Cañón) is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).[5]
The canyon and adjacent rim are contained within Grand Canyon National Park, the Kaibab National Forest, Grand Canyon-Parashant National Monument, the Hualapai ... {open}
https://en.wikipedia.org/wiki/Grand_Canyon |
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