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