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Question: The Columbia Plateau in Washington and Oregon is ________.

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  1.  a flood basalt plateau
  2.  a thick stack of welded-tuff layers
  3.  a caldera filled with rhyolite lava flow.
  4.  a field of large stratovolcanoes

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1.  A flood basalt plateau

The Columbia Plateau in Washington and Oregon is a flood basalt plateau.


The Columbia Plateau is a geographical region located in across parts of the U.S. states of Washington, Oregon, and Idaho.

It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains, cut through by the Columbia River.

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