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