Explain how you arranged the rock layers in the simulations. How did you infer which layer was the newest? How did you know which layers should be next to each other?

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the american rail road was the most influential and useful transportation system developed in the 1800's with steam locomotives and in the very late 1800's and early 1900's diesel electric locomotives being used to transport goods and people around the newly expanded united states!

d. hip hop

it was originated in the 70s while the harlem renaissance occured in the 1920s