Rocks and Minerals — Test

Question 20 • Earth and Space Science

Which observation most strongly supports the conclusion that mechanical stress alone can reorganize mineral structure in solid rock without melting?

Answer

The coarse crystalline substrate displays alternating mineral zones that resulted from the combined effects of heat and compression.

The fine-layered sediment substrate shows planar mineral bands produced under direct pressure without the aid of heat or fluids.

The volcanic substrate contains metallic veins formed as circulating fluids deposited new minerals in open spaces.

The carbonate-rich substrate developed a mosaic of interlocking crystals after mild heating and limited fluid flow.

Explanation

The conclusion requires evidence that pressure alone can reorganize minerals while the rock remains solid. Choice B describes planar mineral bands formed by direct pressure without heat or fluids, so it most directly supports that conclusion. Choice A includes heat, and choices C and D involve heating or fluid-driven mineral changes.

AI-written and checked against the verified answer.

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