Which of the following statements is NOT true about clastic sedimentary rocks?
A. The amount of pore space decreases as a sand is compacted into sandstone.
B. To be called a sandstone, quartz must make up more than 95 percent of the grains.
C. The natural cement that holds sedimentary rocks together is composed of dissolved minerals that precipitate.
D. Clasts in a conglomerate or breccias can be different rock types or can be all the same rock type.
Answer: B
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