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hram777 [196]
3 years ago
12

Shields are a. composed of extensive areas of sedimentary layers laid down on lava flows. b. composed of rocks that were metamor

phosed during recent (less than a million years ago) mountain-building events. c. rarely exposed at the Earth's surface and contain blueschist. d. composed of some of the oldest rock on the Earth.
Geography
1 answer:
konstantin123 [22]3 years ago
7 0

Answer:

A.

Explanation:

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