Final answer:
Sedimentary rocks have the most extensive occurrence at the surface of the continental United States.
Step-by-step explanation:
Based on the distribution of rock types in North America, sedimentary rocks have the most extensive occurrence at the surface of the continental United States. Sedimentary rocks are formed by the accumulation and cementation of sediments, and they are exposed throughout North America of all geologic ages. Examples of sedimentary rocks include sandstone and shale.