1) Some students make a model to show one of the first steps in the formation of sedimentary rock. The students pour 2 centimeters of light colored sand into a clear plastic box. Then, they add 1 centimeter of gravel. Finally, they pour 2 centimeters of dark colored sand on top of the gravel. Which characteristic of sedimentary rock does this model best show?  a) Sedimentary rock is made of layers. b) Sedimentary rock is often limestone 2) Erosion is one of the processes involved in the formation of sedimentary rock. Which of these best describes the process of erosion? a) Rocks are broken into smaller pieces that remain in the same location. b) Pieces of rock or soil are carried from one place to another. 3) The diagram below shows the sequence of the processes that turn solid rock into sandstone. Which two processes best complete this diagram? a) Erosion and compaction b) Compaction and cementation 4) The model below shows layers of sediment on the floor of an ocean. Which of the following best explains how these layers can become rock over many years? a) The weight of the water compacts the sediment into rock. b) Pollution caused by humans turns the sediment into rock.

Sedimentary Rocks

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