Explain your answer. In the rock cycle the three main rock types are igneous, sedimentary, and metamorphic. _____ are made of one or more minerals. Rocks. 31) On the cross section shown, place an X to indicate a location where the rock, marble, was formed. Two index fossils are shown and their locations within the rock layers are indicated. A sequence of rock layers is uplifted and eroded. 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. Then, sediment is deposited on the exposed rock layers. These rock layers were once connected, as stated by the rule of lateral continuity. 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. 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. The Law of Faunal Succession explains that fossils found in rock layers are also ordered in this way. These slow geologic processes would require hundreds of millions of years to deposit all the successive sediment layers. also form if layers of rock are eroded away. 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. Rock layers are usually ordered with the oldest layers on the bottom, and the most recent layers on top. The three main groups of rocks are sedimentary,_____, and igneous rocks. 2. an angular unconformity 3. 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. oldest rock unit shown in the given cross section. The processes involved in the rock cycle often take place over millions of years. A)Some rock layers are folded more than others. 11.Base your answer to the following question on the map and cross section below. 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. ROCKS AND LAYERS We study Earth's history by studying the record of past events that is preserved in the rocks.The layers of the rocks are the pages in our history book. 30) Explain why rock unit H in the cross section shown is not one continuous layer. 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. The movement of bedrock along fault Q most probably produced 4. to interpret rock sequences and to identify rock layers 5. Groundwater Movement Answer Key, continued 20. The cross section shows the generalized structure of A through G identify rock layers and Q represents a fault. Can sedimentary rock form directly from metamorphic rock? Distinctive rock layers, such as the Coconino Sandstone, are matched across the broad expanse of the canyon. The ability of a sediment/rock to provide a steady water supply is limited by its permeability, even when fully saturated. Base your answers to questions 36 and 37 on the geologic cross section below of a region of Earth's crust. Metamorphic. Rock layers A through E have been labeled. B)Rock layers were not deposited in the valley areas. No, it must turn to sediment first. 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. The rocks have not been overturned. The youngest rock layers are at the top and the oldest are at the bottom, which is described by the law of superposition. 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