The Columbia Plateau in Washington and Oregon is ________. a. a caldera filled with rhyolite lava flow.b. a thick stack of welded-tuff layers c. a flood basalt plateaud. a field of large stratovolcanoes

asked Jul 19, 2020 51.1k views

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Answer:

b. a thick stack of welded-tuff layers

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Shirley answered Jul 25, 2020

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