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why do geographers divide the eastern u. s. into four subregions?

How does the bare soil surface type affect the amount of runoff

Which barrier to economic development is shown in the following examples?

With these question would be nice i needs them in a hurry which nation leads eastern europe in nuclear energy usage? a ukraine b lithuania c slovakia d solvenia which eastern european nation is popular with skiers? a czech republic b estonia c bulgaria d none are