around four and a half million years ago a river began flowing across the
a river began flowing across the
a river began flowing across the Colorado Plateau carving the Grand
Colorado Plateau carving the Grand
Colorado Plateau carving the Grand Canyon scientists are divided on how the
Canyon scientists are divided on how the
Canyon scientists are divided on how the river came into existence they have two
river came into existence they have two
river came into existence they have two conflicting scenarios the river either
conflicting scenarios the river either
conflicting scenarios the river either worked its way across the plateau from
worked its way across the plateau from
worked its way across the plateau from Southwest to Northeast by headward
Southwest to Northeast by headward
Southwest to Northeast by headward erosion or the other way around by
erosion or the other way around by
erosion or the other way around by spillover for scientists to apply the
spillover for scientists to apply the
spillover for scientists to apply the spillover theory to the Grand Canyon
spillover theory to the Grand Canyon
spillover theory to the Grand Canyon they have to find a lake and it is
they have to find a lake and it is
they have to find a lake and it is likely to be in the East where the
likely to be in the East where the
likely to be in the East where the elevation is higher today there is no
elevation is higher today there is no
elevation is higher today there is no lake but there are two hundred feet of
lake but there are two hundred feet of
lake but there are two hundred feet of green layered deposits remnants of an
green layered deposits remnants of an
green layered deposits remnants of an ancient lake called Lake video Qi and so
ancient lake called Lake video Qi and so
ancient lake called Lake video Qi and so this green layer right here reflects the
this green layer right here reflects the
this green layer right here reflects the idea that Lake viduh Ho Chi was in
idea that Lake viduh Ho Chi was in
idea that Lake viduh Ho Chi was in existence east of the Grand Canyon
existence east of the Grand Canyon
existence east of the Grand Canyon between sixteen and six million years
between sixteen and six million years
between sixteen and six million years ago over ten million years a lake
ago over ten million years a lake
ago over ten million years a lake deposited fine-grained sediments like
deposited fine-grained sediments like
deposited fine-grained sediments like silt clay and sand mixed with grey
silt clay and sand mixed with grey
silt clay and sand mixed with grey volcanic ash the deposits indicate the
volcanic ash the deposits indicate the
volcanic ash the deposits indicate the existence of a lake but they don’t show
existence of a lake but they don’t show
existence of a lake but they don’t show how the lake over spilled and carved the
how the lake over spilled and carved the
how the lake over spilled and carved the canyon
canyon
canyon John Douglas geography professor at
John Douglas geography professor at
John Douglas geography professor at Paradise Valley Community College in
Paradise Valley Community College in
Paradise Valley Community College in Arizona wanted an effective way to test
Arizona wanted an effective way to test
Arizona wanted an effective way to test the theory he built a small scale model
the theory he built a small scale model
the theory he built a small scale model of the Grand Canyon to demonstrate how
of the Grand Canyon to demonstrate how
of the Grand Canyon to demonstrate how the lake could have overflowed
the lake could have overflowed
the lake could have overflowed six million years ago the canyon wasn’t
six million years ago the canyon wasn’t
six million years ago the canyon wasn’t yet carved but Lake bit of Ho Chi was
yet carved but Lake bit of Ho Chi was
yet carved but Lake bit of Ho Chi was full to the point of overflow and then
full to the point of overflow and then
full to the point of overflow and then as a lake came in the lake filled it
as a lake came in the lake filled it
as a lake came in the lake filled it filled and filled higher and iron higher
filled and filled higher and iron higher
filled and filled higher and iron higher until eventually spilled across the
until eventually spilled across the
until eventually spilled across the lowest point across the Kaibab plateau
lowest point across the Kaibab plateau
lowest point across the Kaibab plateau and then water poured down the other
and then water poured down the other
and then water poured down the other side those waterfalls continued to
side those waterfalls continued to
side those waterfalls continued to retreat back and the whole time you’re
retreat back and the whole time you’re
retreat back and the whole time you’re cutting Grand Canyon Douglass suggests
cutting Grand Canyon Douglass suggests
cutting Grand Canyon Douglass suggests that Lake Buddha Ho Chi drained and
that Lake Buddha Ho Chi drained and
that Lake Buddha Ho Chi drained and formed a stream a steep gradient of the
formed a stream a steep gradient of the
formed a stream a steep gradient of the riverbed caused the stream to cut deep
riverbed caused the stream to cut deep
riverbed caused the stream to cut deep into the rock over time the size of the
into the rock over time the size of the
into the rock over time the size of the stream increased and more and more water
stream increased and more and more water
stream increased and more and more water poured out of the lake which in turn cut
poured out of the lake which in turn cut
poured out of the lake which in turn cut deeper and deeper into the rock
but not all geologists agree they say
but not all geologists agree they say there is no evidence of their ever being
there is no evidence of their ever being
there is no evidence of their ever being a lake large enough to carve the Grand
a lake large enough to carve the Grand
a lake large enough to carve the Grand Canyon so at present there is still no
Canyon so at present there is still no
Canyon so at present there is still no definitive answer as to how the river
definitive answer as to how the river
definitive answer as to how the river came into existence
what we do know is that when it began
what we do know is that when it began flowing around four and a half million
flowing around four and a half million
flowing around four and a half million years ago it cut a one-mile deep scar in
years ago it cut a one-mile deep scar in
years ago it cut a one-mile deep scar in the surface
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