The Grand Canyon, which was previously thought to have been carved out by the Colorado river, was eroded away by a lava flow, according to a newer theory, took on its current form at an earlier date 6 to 7 million years ago.
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A
which was previously thought to have been carved out by the Colorado River, was eroded away by a lava flow, according to a newer theory,
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B
previously thought to have been carved out by the Colorado River eroded away by a lava flow, according to a newer theory, and
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C
previously thought to have been carved out by the Colorado River, was eroded away by a lava flow, according to a newer theory, and
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D
previously thought to have been carved out by the Colorado River, according to a newer theory, it eroded away by a lava flow and
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E
previously thought to have been carved out by the Colorado River, according to a newer theory, which was eroded away by a lava flow and
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