1. How did the rock of the Great Plains and Rocky Mountains form?

Choose the claim you can eliminate.

Responses

They formed as one rock formation, and then something separated them.
They formed as one rock formation, and then something separated them.

One rock formation formed before the other. Then, the minerals from the older rock became part of the younger rock.
One rock formation formed before the other. Then, the minerals from the older rock became part of the younger rock.
What do we still need to know in order to determine why the two rock formations have such similar minerals?
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Evidence Card E: Rocky Mountains. Photo of the Rocky Mountains. Observations: The large mountains have jagged tops. The chunks of rock vary in size. The rock appears to be light and dark gray. There is a forest at base of the mountains.
Evidence Card C: Rock from the Rocky Mountains. Photo of a rose-colored rock with dark veins. Observations: The rock contains visible pink, dark gray, and light brown grains. The grains fit together. The grains have sharp edges. There are no bubbles or fossils in this sample.
Why can we eliminate the claim you selected?