kingstonsingh75 kingstonsingh75

07-09-2017
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Which describes a major challenge facing the builders of the transcontinental railroad?

A. bridging the Rio Grande River

B. spanning the Grand Canyon

C. tunneling under Lake Erie

D. crossing the Sierra Nevada mountains

Respuesta :

DeathTheKid101 DeathTheKid101

07-09-2017

Crossing the Sierra Nevada Mountains would be your answer. Answer: D.

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