Most of the _____ of the United States has/have a very thin blanket - only 1000 to 2000 meters - of sedimentary rock layers.

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The craton, which is the stable interior portion of the North American continent, has a very thin blanket of sedimentary rock layers ranging from 1000 to 2000 meters. The other regions listed have much thicker and more complex sedimentary rock layers. The Gulf Coast, for example, has up to 20 kilometers of sediments, while the Rocky Mountain region has sedimentary rocks that are more than 10 kilometers thick. The Oregon-Washington coast and Blue Ridge Mountains also have thicker sedimentary rock layers.

Most of the _____ of the United States Has/have a Very