The Columbia River plateau in the northwestern United States is an example of a(n) ____, in which lava covers the landscape like a flood.

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The description of the landscape being covered in lava like a flood is characteristic of a flood basalt, which is a type of volcanic activity that covers vast areas with multiple layers of lava flows. Composite flow, ash-flow tuff, and welded tuff do not involve large-scale lava flows.

The Columbia River Plateau in the Northwestern United States Is