Question

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3. How has the landscape of the Columbia Plateau been shaped by prehistoric volcanoes?

A. Massive erosion created giant ravines.

B. The landscape is not suitable for agriculture.

C. The region is marked by basalt rock formations.

D. Volcanic mountains characterize the region.

Answer 1

A.

Step-by-step explanation:

the plateau was formed by a series of eruptions, each new eruption spreading fresh lava over the last layer. These are scars left by a gigantic flood that swept over the plateau thousands of years ago.