TEKS 5.11A The student knows that certain past events affect present and future events. The student is expected to identify and observe actions that require time for changes to be measurable, including growth, erosion, dissolving, weathering, and flow. Which layer of the above soil profile would be affected the most by weathering and erosion? A. B. C. D. 1 2 3 4 The correct answer is A. Layer 1 is the top layer of soil exposed to the wind, rain, flooding and ice/snow. It will be the layer most affected by the physical environment around it. The other answers are incorrect because… Layers 2-4 are all below the surface of the Earth. They would not be the most affected by weathering and erosion as the top layer. Wave Action against solid rock can cause changes in the rock structure. What is the correct sequence of erosion of the following rock surface? A. B. C. D. A, B, C, D D, B, C, A B, C, D, A C, D, B, A The correct answer is B. Wave action has changed the rock structure by wearing away the softer rock particles. The diagrams are arranged in order from a solid rock structure to the beginnings of a cave to the development of an arch from the cave and finally the wearing away of the top of the arch. The other answers are incorrect because… The pictures are out of sequence for erosion by wave action.