1 Shoreline Erosion and Deposition

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1 CHAPTER 3 1 Shoreline Erosion and Deposition SECTION Agents of Erosion and Deposition BEFORE YOU READ After you read this section, you should be able to answer these questions: What is a shoreline? How do waves shape shorelines? National Science Education Standards ES 1c How Do Waves Form? Waves form when wind blows over the surface of the ocean. Strong winds produce large waves. The waves move toward land. When waves crash into the land over a long time, they can break rock down into smaller pieces. These pieces are called sand. A shoreline is a place where the land and the water meet. Most shorelines contain sand. The motion of waves helps to shape shorelines. During erosion, waves remove sand from shorelines. During deposition, waves add sand to shorelines. WAVE TRAINS Waves move in groups called wave trains. The waves in a wave train are separated by a period of time called the wave period. You can measure the wave period by counting the seconds between waves breaking on the shore. Most wave periods are 10 to 20 s long. When a wave reaches shallow water, the bottom of the wave drags against the sea floor. As the water gets shallower, the wave gets taller. Soon, it can t support itself. The bottom slows down. The top of the wave begins to curl, fall over, and break. Breaking waves are called surf. STUDY TIP Summarize Read this section quietly to yourself. Talk about what you learned with a partner. Together, try to figure out the answers to any questions that you have. 1. Compare How is wave erosion different from wave deposition? Waves travel in groups called wave trains. The time between one wave and the next is the wave period. Math Focus 2. Calculate A certain wave train contains 6 waves. The time between the first wave and the last wave is 72 seconds. What is the wave period? Interactive Textbook 39 Agents of Erosion and Deposition

2 3. Identify Give two ways that waves can break rock into smaller pieces. Critical Thinking 4. Identify Relationships When may a storm not produce high-energy waves? POUNDING SURF The energy in waves is constantly breaking rock into smaller and smaller pieces. Crashing waves can break solid rock and throw the pieces back toward the shore. Breaking waves can enter cracks in the rock and break off large boulders. Waves also pick up fine grains of sand. The loose sand wears down other rocks on the shore through abrasion. What Are the Effects of Wave Erosion? Wave erosion can produce many features along a shoreline. For example, sea cliffs form when waves erode rock to form steep slopes. As waves strike the bottom of the cliffs, the waves wear away soil and rock and make the cliffs steeper. How fast sea cliffs erode depends on how hard the rock is and how strong the waves are. Cliffs made of hard rock, such as granite, erode slowly. Cliffs made of soft rock, such as shale, erode more quickly. During storms, large, high-energy waves can erode the shore very quickly. These waves can break off large chunks of rock. Many of the features of shorelines are shaped by storm waves. The figures below and on the next page show some features that form because of wave erosion. 5. Compare How is a sea stack different from a sea arch? Interactive Textbook 40 Agents of Erosion and Deposition

4 This beach in New England is made of large rocks. Smaller sand particles are washed away during storms. This beach in Florida is made of light-colored quartz sand. 9. Explain Why are some beaches made mostly of larger rock pieces, instead of sand? This beach in Hawaii is made of dark-colored sand from igneous rocks. The sand at this beach in California is made of lightcolored minerals. WAVE ANGLE AND SAND MOVEMENT Waves can move sand along a beach. The movement of the sand depends on the angle at which the waves hit the shore. Longshore currents form when waves hit the shore at an angle. The waves wash sand onto the shore at the same angle that the waves are moving. However, when the waves wash back into the ocean, they move sand directly down the slope of the beach. This causes the sand to move in a zigzag pattern, as shown in the figure below. The sand moves down the beach in a zigzag pattern. Waves hitting the shore move sand in the same direction that the waves are traveling. Wave direction 10. Infer Why don t longshore currents form in places where waves hit the shore head-on? Waves wash back into the ocean and carry sand straight down the slope of the beach. Direction of longshore current Interactive Textbook 42 Agents of Erosion and Deposition

5 OFFSHORE DEPOSITS Longshore currents can carry beach material offshore. This process can produce landforms in open water. These landforms include sandbars, barrier spits, and barrier islands. A sandbar is a ridge of sand, gravel, or broken shells that is found in open water. Sandbars may be completely under water or they may stick up above the water. A barrier spit is a sandbar that sticks up above the water and is connected to the shoreline. Cape Cod, Massachusetts, is an example of a barrier spit. It is shown in the figure below. 11. Define What is a sandbar? Cape Cod, Massachusetts, is an example of a barrier spit. Barrier spits form when sandbars are connected to the shoreline. 12. Identify What is a barrier spit? A barrier island is a long, narrow island that forms parallel to the shoreline. Most barrier islands are made of sand. 13. Compare What is the difference between a barrier island and a barrier spit? Santa Rosa Island in Florida is an example of a barrier island. Interactive Textbook 43 Agents of Erosion and Deposition

6 Section 1 Review NSES ES 1c SECTION VOCABULARY beach an area of the shoreline that is made up of deposited sediment shoreline the boundary between land and a body of water 1. Compare How is a shoreline different from a beach? 2. Explain Where does the energy to change the shoreline come from? Explain your answer. 3. Identify Give two examples of different-colored beach sand and explain why each kind is a certain color. 4. Explain How do longshore currents move sand? 5. List Give five landforms that are produced by wave erosion. Interactive Textbook 44 Agents of Erosion and Deposition

7 G Earth s Changing Surface Answer Key continued 3. Weathering happens when rocks are broken down into smaller pieces. Erosion happens when soil and sediment are moved from one place to another. 4. soil damage and erosion 5. contour plowing, terraces, no-till farming, cover crops, and crop rotation 6. In no-till farming, stalks from older crops are left lying on the ground. The stalks help to protect the soil from wind and rain. This helps to reduce soil erosion. Chapter 3 Agents of Erosion and Deposition SHORELINE EROSION AND DEPOSITION 1. Waves remove sand from shorelines during erosion and add sand during deposition s 3. Crashing waves can break solid rock apart. Water can enter cracks in the rock and break pieces off. 4. If the storm does not include strong winds, large waves will probably not be produced. 5. Sea arches are connected to the mainland, but sea stacks are not. 6. a body of rock that sticks out into the sea 7. A beach is an area along a shoreline that is covered by materials that were carried there by waves. 8. quartz 9. Sand particles are washed away during storms. 10. Waves wash onto the beach in the same direction that they wash off the beach, so there is no sideways movement of water. 11. a ridge of deposited material in open water 12. a sandbar that is connected to the shoreline 13. Barrier spits are connected to the shore, but barrier islands are not. Review 1. A shoreline is the boundary between land and water. A beach is part of a shoreline that is made of deposited sediment. 2. Answers include: wind (produces waves, which erode and add to the shore), waves 3. The sand can have different colors, which come from the kind of rock it is made from. Black sand can form from the weathering of dark-colored lava. Light-colored sand may be made of light-colored minerals, such as quartz. 4. Waves carry sand up the shore parallel to their direction of travel. The waves wash back into the ocean perpendicular to the shoreline. This causes sand to move in a zig-zag pattern parallel to the shoreline. 5. sea arches, sea stacks, headlands, wave-cut terraces, sea caves SECTION 2 WIND EROSION AND DEPOSITION 1. They hold the soil and rock in place. 2. Large particles are too heavy, and the wind doesn t have enough energy to carry them. 3. the process in which small sediment particles are removed by the wind, leaving behind larger particles 4. Process Description Saltation Deflation Abrasion Large particles bounce and skip along the ground. Small particles are removed by wind. Rock pieces are worn away by wind-carried sand. 5. Fast winds have more energy, so they can lift larger particles. 6. a mound of wind-deposited sand 7. the same direction the wind is blowing 8. The windward slope has a gentler angle than the slip face. Review 1. desert pavement, deflation hollows 2. areas with little plant cover and/or with fine, loose soil or sand, such as coastlines and deserts 3. Student should label the gently sloping side windward slope and the steeply dipping side slip face ; the arrow should point to the right. 4. When wind hits a barrier, such as a plant, a rock, or a building, it slows down. The sediment that it has been carrying is deposited onto the barrier, making the barrier larger. Eventually, the barrier is completely covered by sediment, forming a dune. 5. The wind can carry small particles the farthest because they weigh the least. Interactive Textbook Answer Key 47 Earth s Changing Surface

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