anonymous user


How was the Columbia River formed?

Topics: ScienceGeographyU.S. Rivers, United States


Stacy Johnston

Between 17 million and 6 million years ago, huge outpourings of flood basalt lava covered the Columbia River Plateau and forced the lower Columbia into its present course. The Cascade Range began to uplift during the early Pleistocene era (two million to 700,000 years ago). Cutting through the uplifting mountains, the Columbia River created the Columbia River Gorge.

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How was the Columbia River formed?

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