Nourn
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A student made observations of four rock samples. Which of these observations most likely describes a sedimentary rock?

A: Sample 1 has bands of light and dark crystals.
B: Sample 2 has pink, gray, and white crystals grown together.
C: Sample 3 is made up of one huge, pale pink crystal.
D: Sample 4 is made up of layers of sand grains cemented together.