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Explain the cause for movement river valley civilization to early industrial centers

Because north america is in a it has a variety of biomes and climates. a. high latitude zone c. middle latitude zone b. middle longitude zone d. high longitude zone select the best answer from the choices provided a b c d

Which are evidence of the seafloor spreading? a. molten material b. magnetic stripes c. continental material d. drilled core samples e. ocean water samples