Chapter 14: The Ocean Floor

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1 Chapter 14: The Ocean Floor Section 1: The Vast World Ocean I. The Blue Planet Group # II. Geography of the Oceans Group # III. Mapping the Ocean Floor Group # A. Sonar Group # B. Satellites Group # C. Submersibles Group # Section 2: Ocean Floor Features I. Continental Margins Group # A. Continental Shelf Group # B. Continental Slope Group # C. Continental Rise Group # II. Ocean Basin Floor Group # A. Deep-Ocean Trenches Group #

2 B. Abyssal Plains Group # C. Seamounts and Guyots Group # III. Mid-Ocean Ridges Group # A. Seafloor Spreading Group # B. Hydrothermal Vents Group # Section 3: Seafloor Sediments I. Types of Seafloor Sediments Group # A. Terrigenous Sediment Group # B. Biogenous Sediment Group # C. Hydrogenous Sediment Group # Section 4:Resources From The Seafloor I. Energy Resources Group # A. Oil And Natural Gas Group # B. Gas Hydrates Group #

3 II. Other Resources Group # A. Sand and Gravel Group # B. Manganese Nodules Group # C. Evaporative Salts Group #

4 Chapter 17: The Atmosphere: Structure and Temperature Section 1: Atmosphere Characteristics I. Composition of the Atmosphere Group # A. Major Components Group # B. Variable Components Group # C. Human Influence Group # Height and Structure of the Atmosphere Group # A. Pressure Changes Group # B. Temperature Changes Group # III. Earth-Sun Relationships Group # A. Earths Motion Group # B. Earths Orientation Group# C. Solstices and Equinoxes Group # D. Length of Daylight Group #

5 Section 2:Heating the At mosphere I. Energy Transfer as Heat Group # A. Conduction Group# B. Convection Group # C. Electromagnetic Waves Group # D. Radiation Group # What Happens To Soar Radiation Group # A. Reflection and Scaterring Group # B. Absorption: Group # C. Photosynthesis Group # Section 3: Temnerature Controls Why Temperatures Vary Group # A. Land and Water Group # B. Geographic Position Group # C. Altitude Group #

6 D. Cloud Cover and Albedo Group # E. World Distribution of Temperature Group #

7 Chapter 14 The Ocean Floor Section 14.1 The Vast World Ocean This section discusses how much of Earth is covered by water and how that water is studied. Reading Strategy Building Vocabulary As you read the section, define each term in the table in your own words. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Vocabulary Term oceanography a. Definition bathymetry b. sonar c. submersible d. The Blue Planet 1. Is the following sentence true or false? The science of oceanography includes the study of the geological, chemical, physical, and biological characteristics of the world ocean. 2. Circle the letter of the percentage of Earth s surface covered by the global ocean. a. 11 percent b. 29 percent c. 71 percent d. 99 percent Geography of the Oceans Match each description with its ocean. Description 3. shallowest ocean 4. located almost entirely in the Southern Hemisphere 5. about half the size of the Pacific 6. largest and deepest ocean Ocean a. Pacific b. Atlantic c. Indian d. Arctic Earth Science Guided Reading and Study Workbook 104

8 Chapter 14 The Ocean Floor 7. Using the following map, list the names of Earth s four main ocean basins from smallest to largest. a. b. c. d Arctic Ocean 30 0 Pacific Ocean Atlantic Ocean Indian Ocean Looking at the map, what ocean(s) does 0º longitude intersect? 9. Look at the map and then circle the letter of the location of the Indian Ocean. a. 1ºN 1ºW b. 30ºN 30ºW c. 30ºS 150ºW d. 30ºS 90ºE Mapping the Ocean Floor 10. Is the following sentence true or false? The ocean floor s topography is much less diverse than that of the continents. 11. What do scientists call the charting of the ocean floor and the measurement of its depths? 12. Electronic depth-sounding equipment called allowed scientists in the 1920s and later to precisely measure ocean depth. 13. How are satellites used to measure ocean surface height? 14. Is the following sentence true or false? Submersibles make it possible for scientists to collect data from areas of the ocean that were previously unreachable. Earth Science Guided Reading and Study Workbook 105

9 Chapter 14 The Ocean Floor Section 14.2 Ocean Floor Features This section discusses the features found in the three main regions of Earth s ocean floor. Reading Strategy Outlining In the outline, use the green headings as the main topics and the blue headings as subtopics. As you read, add supporting details. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. I. Continental Margins A. Continental Shelf B. Continental Slope C. II. A. 1. What are the three ocean floor regions that have their own unique characteristics? Continental Margins 2. A(n) can best be described as a transition zone between an ocean basin floor and a continent. 3. What covers the Atlantic Ocean s continental margin? 4. Is the following sentence true or false? The continental margin of the Pacific Ocean has very little volcanic or earthquake activity. Earth Science Guided Reading and Study Workbook 106

10 Chapter 14 The Ocean Floor 5. Write the letter of each of the following features of the continental margin shown in the figure. submarine canyon continental slope continental shelf continental rise B A C D 6. What economic and political significance do continental shelves have? 7. Circle the letter of occasional movements down the continental slope of dense water rich in sediment. a. submarine flows b. turbidity currents c. continental rises d. guyots Ocean Basin Floor 8. Is the following sentence true or false? The area covered by the ocean basin floor is comparable to the percentage of land on Earth s surface that is above sea level. Match each description with its ocean feature. Description 9. submerged volcanic peak 10. submerged, flat-topped peak 11. crease in the ocean floor formed where one plate plunges beneath another 12. flat feature formed when suspended sediments settle from turbidity currents Ocean Feature Mid-Ocean Ridges 13. Circle the letter of the location where new ocean floor forms. a. mid-ocean ridge b. trench c. continental shelf d. continental rise a. abyssal plain b. guyot c. seamount d. trench 14. is the moving apart of two plates at divergent plate boundaries. Earth Science Guided Reading and Study Workbook 107

11 Chapter 14 The Ocean Floor Section 14.3 Seafloor Sediments This section describes three types of ocean floor sediments. Reading Strategy Summarizing Complete the table with all the headings for the section. Write a brief summary of the text for each heading. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Actions at Boundaries I. Types of Seafloor Sediments Terrigenous sediments originated on land. Biogenous sediments are biological in origin. 1. Is the following sentence true or false? In general, as you move from the continental shelf toward the deep-ocean floor, sediments become coarser. 2. Circle the letter of the usual amount of seafloor sediments in a given location. a. about 100 to 450 m b. about 500 to 1000 m c. about 100 to 450 km d. about 500 to 1000 km Types of Seafloor Sediments 3. Circle the letters of the three categories of ocean floor sediments. a. terrigenous sediment b. biogenous sediment c. manganese sediment d. hydrogenous sediment Earth Science Guided Reading and Study Workbook 108

12 Chapter 14 The Ocean Floor Match how each sediment forms with its type of sediment. How Sediment Forms Type of Sediment 4. crystallizes directly from ocean water through chemical reactions a. hydrogenous b. terrigenous 5. accumulates on the ocean floor after erosion and transportation c. biogenous from land 6. accumulates on the ocean floor when marine animals and algae die and their hard parts sink 7. Complete the following chart with the types and descriptions of how the three types of hydrogenous sediments form. Types of Hydrogenous Sediments How They Form 8. Biogenous sediment called consists mostly of shells of radiolarians and diatoms. 9. Circle the letter of a material that, when buried and hardened, becomes a type of limestone. a. evaporites b. radiolarians c. calcareous ooze d. calcium carbonates 10. Ocean sediment made up of the calcium carbonate shells of marine organisms is called. 11. Is the following sentence true or false? Ocean-floor sediments are usually mixtures of the various sediment types. Earth Science Guided Reading and Study Workbook 109

13 Chapter 14 The Ocean Floor Section 14.4 Resources from the Seafloor This section discusses the energy and mineral resources obtained from Earth s seafloor. Reading Strategy Identifying Details As you read, complete the concept map to identify details about resources from the ocean. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Sand and Gravel consist of are used for sometimes contain a. b. c. Energy Resources 1. Circle the letter of the main energy products currently being obtained from the seafloor. a. gas hydrates and salts b. coal and oil c. natural gas and gas hydrates d. natural gas and oil 2. The source of today s natural gas and oil deposits is the ancient remains of microscopic. 3. Is the following sentence true or false? The majority of the world s oil is produced from ocean floor resources. 4. What is one environmental concern about offshore petroleum exploration? Earth Science Guided Reading and Study Workbook 110

14 Chapter 14 The Ocean Floor 5. Compact chemical structures made of water and natural gas under the ocean floor are called. 6. How do gas hydrates form? 7. Is the following sentence true or false? When brought up from the ocean floor to the ocean surface, gas hydrates rapidly break down. Other Resources 8. Circle the letter of the method of obtaining sand and gravel from the ocean. a. drilling offshore b. mining with suction devices c. collecting with submersibles d. evaporating from ocean water 9. How do manganese nodules form? 10. Complete the following flowchart to show how evaporative salts form. b. Salts in seawater increase in concentration. Earth Science Guided Reading and Study Workbook 111

15 Chapter 17 The Atmosphere: Structure and Temperature Section 17.1 Atmosphere Characteristics This section describes the components and vertical structure of the atmosphere. It also explains how the relationship between Earth and the sun causes the seasons. Reading Strategy Comparing and Contrasting As you read, complete the Venn diagram by comparing and contrasting summer and winter solstices. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Summer Solstice Winter Solstice a. c. b. 1. is the state of the atmosphere at any given time and place. Composition of the Atmosphere 2. Circle the letter of the gas that is the largest component of the atmosphere. a. oxygen b. nitrogen c. water vapor d. carbon dioxide 3. Is the following sentence true or false? The source of all clouds and precipitation is water vapor. 4. Why is the ozone layer crucial to life on Earth? Height and Structure of the Atmosphere 5. Is the following sentence true or false? Atmospheric pressure increases with height. Earth Science Guided Reading and Study Workbook 126

Chapter 17 The Atmosphere: Structure and Temperature 6. Select the appropriate letter in the figure that identifies each of the following layers of the atmosphere.

Circle the letter of the layer of the atmosphere that contains the ozone layer. a. troposphere b. stratosphere c. mesosphere d. thermosphere Earth-Sun Relationships 9.

16 Chapter 17 The Atmosphere: Structure and Temperature 6. Select the appropriate letter in the figure that identifies each of the following layers of the atmosphere. mesosphere thermosphere troposphere stratosphere Height (km) A B Height (miles) In the figure, the atmosphere is divided vertically into four layers based on C Circle the letter of the layer of the atmosphere that contains the ozone layer. a. troposphere b. stratosphere c. mesosphere d. thermosphere Earth-Sun Relationships 9. What are Earth s two principal motions? D E F G Temperature Mt. Everest O Z O N E Select the appropriate letter in the figure that identifies each of the following months. March December June September C F 32 Temperature Arctic Circle Tropic of Cancer Equator Tropic of Capricorn B Orbit C A 11. Is the following sentence true or false? At position B in the figure, the Northern Hemisphere will have longer daylight than darkness. 12. What causes seasonal changes? Sun 23 1 / 2 DD Earth Science Guided Reading and Study Workbook 127

17 Chapter 17 The Atmosphere: Structure and Temperature Section 17.2 Heating the Atmosphere This section describes the three ways in which heat can be transferred. It also explains what happens to solar radiation that hits Earth s atmosphere and surface. Reading Strategy Using Prior Knowledge Before you read, write your definition for each term. After you read, write the scientific definition of each term and compare it to your original definition. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Term Your Definition Scientific Definition Heat Temperature Energy Transfer as Heat Match each description with its mechanism of energy transfer. Description Mechanism of Energy Transfer 1. transfer of heat by mass movement a. radiation or circulation within a substance b. convection 2. transfer of heat through matter c. conduction by molecular activity 3. transfer of heat without requiring a medium to travel through 4. Circle the letter of the act of light bouncing off an object. a. absorption b. scattering c. reflection d. radiation Earth Science Guided Reading and Study Workbook 128

18 Chapter 17 The Atmosphere: Structure and Temperature 5. Complete the chart below. Mechanism of Energy Transfer Mechanism Requires direct contact? Requires a medium? Conduction yes Convection Radiation 6. Is the following sentence true or false? All objects at any temperature emit radiant energy. 7. Hotter objects emit total energy per unit area than colder objects do. 8. Is the following sentence true or false? The hotter a radiating body is, the longer the wavelengths of maximum radiation it will produce. 9. Objects that are good absorbers of radiation are also good of radiation. What Happens to Solar Radiation? 10. List three things that can happen when radiation strikes an object. 11. Circle the letter of the process that produces rays that travel in all directions. a. absorption b. transmission c. reflection d. scattering 12. About percent of the solar energy reaching the outer atmosphere is reflected or scattered back into space. 13. What is the greenhouse effect? 14. Is the following sentence true or false? Another term for the greenhouse effect is global warming. Earth Science Guided Reading and Study Workbook 129

19 Chapter 17 The Atmosphere: Structure and Temperature Section 17.3 Temperature Controls This section describes the factors that influence temperature and discusses worldwide temperature distribution. Reading Strategy Previewing Before you read, use Figure 15 to describe the temperature variations for Vancouver and Winnipeg. For more information on this Reading Strategy, see the Reading and Study Skills in the Skills and Reference Handbook at the end of your textbook. Vancouver Temperature Variations Winnipeg Why Temperatures Vary 1. List five factors other than latitude that exert a strong influence on temperature. Match each location with its effect on temperature. You may use some effects more than once. Effect on Location Temperature 2. windward of a large a. lower temperatures body of water b. higher temperatures 3. at a low altitude c. more moderate temperatures 4. on a leeward coast d. less moderate temperatures 5. behind a mountain range 6. at a high altitude 7. Circle the letter of the sentence that is true. a. Land heats more rapidly and cools more slowly than water. b. Land heats more rapidly and cools more rapidly than water. c. Land heats more slowly and cools more slowly than water. d. Land heats more slowly and cools more rapidly than water. Earth Science Guided Reading and Study Workbook 130

20 Chapter 17 The Atmosphere: Structure and Temperature 8. Why does the Southern Hemisphere have smaller annual temperature variations than the Northern Hemisphere? 9. Is the following sentence true or false? A location on a windward coast will have a more moderate climate than an inland location at the same latitude. 10. Mountains can affect temperatures by acting as. 11. How does altitude affect mean temperature? 12. Circle the letter of the correct definition of albedo. a. line that connects points with the same temperature b. fraction of total radiation reflected by a surface c. trapping of heat in Earth s atmosphere d. transfer of heat by movement within a substance 13. What effect do clouds have on incoming solar radiation? 14. Is the following sentence true or false? Clouds have the same effect on temperatures during the night as they do during the day. World Distribution of Temperature 15. Circle the letter of the lines on a map that connect points with the same temperature. a. albedos b. altitudes c. latitudes d. isotherms 16. What general trend does a world isothermal map show? Earth Science Guided Reading and Study Workbook 131

Section 14.1 The Vast World Ocean This section discusses how much of Earth is covered by water and how that water is studied.

Section 14.1 The Vast World Ocean This section discusses how much of Earth is covered by water and how that water is studied. Reading Strategy Building Vocabulary As you read the section, define each term