Which north american geographic feature was not formed by retreating glaciers during the last ice age? a. niagara falls b. the grand canyon c. the great lakes d. the upper mississippi river

There are so many. The Mississippi delta. The Grand Canyon of Arizona. Every volcano. The Bonneville salt flats.

there were three types of british colonies: royal, proprietary, and self-governing. each type had its own characteristics. proprietary colonies, such as pennsylvania, maryland, and delaware, were basically land grants from the british government.

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