The Marine Environment
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1 The Marine Environment SECTION 16.1 Shoreline Features In your textbook, read about erosional landforms, beaches, estuaries, longshore currents, and rip currents. For each statement below, write true or false. 1. Waves move more slowly in deep water than in shallow water. 2. Wave crests bend as they move into shallow water in a process called wave refraction. 3. The force of breakers, along with rock fragments suspended in water, can erode solid rock. 4. Rocky headlands, which are points of land reaching into the ocean, are eroded by waves. 5. Most of a breaker s energy is concentrated along beaches. 6. A wave-cut platform ends against a steep wave-cut cliff. 7. Sea caves are formed by erosion from breakers. 8. Wide, sandy beaches are the result of loose sediments carried away from the shore by waves. 9. Beaches made of pebbles are usually found on rocky coasts. 10. The water in an estuary is always salty. 11. Estuaries are important because they are nurseries for the young of many species. 12. The water current that flows parallel to the shore is called a longshore current. 13. Fine-grained materials, such as clay, fall to the bottom of moving water and are pushed along the bottom by the current. 14. Rip currents move large amounts of sediment along the shore. 15. Rip currents flow through gaps of longshore bars and up onto beaches. Study Guide for Content Mastery Chapter 16 Earth Science: Geology, the Environment, and the Universe 97
2 SECTION 16.1 Shoreline Features, continued In your textbook, read about depositional features of seashores. Use each of the terms below just once to complete the passage. barrier islands deposit sand dunes seashores sediment spit storm waves wave erosion Most (16) are constantly changing due to (17), longshore transport, and (18) deposition. Large storm waves pick up sediments and (19) them wherever waves and currents move more slowly. Sometimes the transported sediments build a narrow bank of sand called a (20) that projects into the water from a bend in the coastline. Longshore currents may also deposit long ridges of sediment to form a chain of (21). Tides and (22) can help currents build features that rise well above sea level. Also, winds blow dry, exposed sediment into (23) along shorelines. Answer the following questions. 24. How are a spit and a tombolo alike? 25. Do you think the shore of a barrier island is a good or bad place to build a house? Why? 98 Chapter 16 Earth Science: Geology, the Environment, and the Universe Study Guide for Content Mastery
3 SECTION 16.1 Shoreline Features, continued In your textbook, read about protective structures. Use the terms below to label each drawing. breakwater groin seawall What happens to the beach in front of a seawall? 30. What happens to a beach located down the coast from a groin? 31. Why does the anchorage behind a breakwater have to be dredged? In your textbook, read about changes in sea level. Underline the term in parenthesis that best completes the statement. 32. About years ago, Earth s seas were (higher, lower) than they are today. 33. The seas are still rising. Many researchers believe the cause is (global warming, lower temperatures on Earth s surface). 34. Coastal valleys scooped out by glaciers and later flooded produce (barrier islands, fjords). 35. Local sea levels can be affected by (tectonic movement, coastal cities). 36. A rising coastline produces a relative (rise, drop) in sea level. Study Guide for Content Mastery Chapter 16 Earth Science: Geology, the Environment, and the Universe 99
4 SECTION 16.2 The Seafloor In your textbook, read about oceanic and continental crust, continental shelves, and continental slopes. Use the terms below to label the diagram. continental crust continental margin continental rise continental shelf continental slope oceanic crust submarine canyons continental margin 3. continental rise Write the name of the topographic feature of the seafloor to the left of its description. 8. Thin crust associated with deep ocean basins 9. Submerged parts of continents 10. Shallowest part of a continental margin reaching seaward from shore 11. Area beyond the continental shelf where the seafloor drops sharply 12. Gentle slope at the base of the continental slope that is formed by sediments deposited by turbidity currents 13. Feature cut into the continental slope by turbidity currents 14. Crust associated with higher elevations on land Chapter 16 Earth Science: Geology, the Environment, and the Universe Study Guide for Content Mastery
5 SECTION 16.2 The Seafloor, continued In your textbook, read about ocean basins. Answer the following questions. 15. About what percent of Earth s surface is ocean floor? 16. What is an abyssal plain? What kind of sediment is found there? 17. What are six identifying features of deep-sea trenches? 18. What are four identifying characteristics of mid-ocean ridges? 19. What is a hydrothermal vent? 20. What are two types of hydrothermal vents? Study Guide for Content Mastery Chapter 16 Earth Science: Geology, the Environment, and the Universe 101
6 SECTION 16.2 The Seafloor, continued In your textbook, read about seafloor volcanoes and marine sediments. Use each of the terms below just once to complete the passage. continents extinct volcanoes guyots nodules ooze seamounts Thousands of solitary mountains on the seafloor are not near areas of active volcanism. Researchers believe that these mountains are (21).There are two types of volcanoes on the seafloor. One type, submerged basaltic volcanoes more than 1kilometer high,are called (22) also called (23) flat, submerged tops..the other type is tablemounts,,which are large,extinct basaltic volcanoes with Sedimentation is the only process that changes structures on the seafloor. Most of the sediments come from (24) include mud, sand, dust, and volcanic ash. (25) and other sources. These sediments is a source of sediment that is formed by the shells and hard parts of marine organisms. Another type of deep-sea sediment is manganese (26) metals precipitate from seawater.,which are formed when If the statement is true, write true.ifit is not true,rewrite the italicized word or phrase to make it true. 27. Once they are formed, seafloor structures last practically forever. 28. The deep ocean floor is covered with mud made of silt, clay, and other fine-grained materials. 29. Sandy sediments sometimes reach the abyssal plains riding on gentle turbidity currents. 30. Deep-sea mud has a reddish color because of manganese in the sediment. 31. Sediments with a large percentage of particles from once-living organisms are called oozes. 32. Oozes are found in the deeper parts of the ocean. 33. Oozes and deep-sea muds accumulate grain by grain to reach the depth of only a few millimeters per thousand years. 102 Chapter 16 Earth Science: Geology, the Environment, and the Universe Study Guide for Content Mastery
The Marine Environment
The Marine Environment SECTION 16.1 Shoreline Features In your textbook, read about erosional landforms, beaches, estuaries, longshore currents, and rip currents. For each statement below, write or. 1.
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