Depending on the material they travel through, the waves may either speed up, slow down, bend, or even stop if they cannot penetrate the material they encounter. also form if layers of rock are eroded away. The three main groups of rocks are sedimentary,_____, and igneous rocks. The ability of a sediment/rock to provide a steady water supply is limited by its permeability, even when fully saturated. The Law of Faunal Succession explains that fossils found in rock layers are also ordered in this way. If the sediment/rock is permeable, the water will flow easily through the sediment/rock and provide a good supply of water for a well. The processes involved in the rock cycle often take place over millions of years. The rocks have not been overturned. Base your answers to questions 36 and 37 on the geologic cross section below of a region of Earth's crust. Most of the rocks exposed at the surface of Earth are sedimentary--formed from particles of older rocks that have been broken apart by water or wind.The gravel, sand, and mud settle to the bottom in rivers, … A through G identify rock layers and Q represents a fault. The dominant view today is that slow and gradual (uniformitarian) processes, similar to the processes we observe in the present, explain the thick, fossil-bearing sedimentary rock layers all over the earth. A)Some rock layers are folded more than others. Rock layers A through E have been labeled. A sequence of rock layers is uplifted and eroded. The shaded areas on the map represent regions of the United States that have evaporite rock layers (layers of rock formed from the evaporation of seawater) under the surface bedrock. No, it must turn to sediment first. 30) Explain why rock unit H in the cross section shown is not one continuous layer. Two index fossils are shown and their locations within the rock layers are indicated. The Three Layer Cake There are thousands upon thousands of layers in the earth's crust. The youngest rock layers are at the top, and the oldest rock layers are at the bottom. oldest rock unit shown in the given cross section. 11.Base your answer to the following question on the map and cross section below. Rock layers are usually ordered with the oldest layers on the bottom, and the most recent layers on top. So on the scale of a human lifetime, rocks appear to be “rock solid” and unchanging, but in the longer term, change is always taking place. Metamorphic. These slow geologic processes would require hundreds of millions of years to deposit all the successive sediment layers. 2. an angular unconformity 3. Explain your answer. If such modeling clay is allowed to dry out, it is no longer pliable but hard and brittle, so any attempt to bend it will cause it to break and shatter. Can sedimentary rock form directly from metamorphic rock? Lines W, X, Y, and Z are locations of unconformities. Base your answer(s) to the following question(s) on the geologic cross section of bedrock shown below. B)Rock layers were not deposited in the valley areas. _____ are made of one or more minerals. Then, sediment is deposited on the exposed rock layers. Explain your answer. The youngest rock layers are at the top and the oldest are at the bottom, which is described by the law of superposition. Rocks. The movement of bedrock along fault Q most probably produced 4. to interpret rock sequences and to identify rock layers 5. The cross section shows the generalized structure of In the rock cycle the three main rock types are igneous, sedimentary, and metamorphic. When solid, hard rock is bent (or folded) it invariably fractures and breaks because it is brittle (Figure 1).1 Rock will bend only if it is still soft and pliable—“plastic” like modeling clay or children’s Playdough. 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