the ocean's composition

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S6E3. Students will recognize the significant role of water in earth processes. Explain that a large portion of the Earth’s surface is water, consisting of oceans, rivers, lakes, underground water, and ice. c. Describe the composition, location, and subsurface topography of the world’s oceans.

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  • 1. EARTH SCIENCE Directions: Read each slide use the RED underlined words to complete the organizer.Tarbuck Lutgens

2. ChapterOcean Water13S6E3. Students will recognize the significant role of water in earth processes. a.Explain that a large portion of the Earths surface is water, consisting of oceans, rivers, lakes, underground water, and ice.c. Describe the composition, location, and subsurface topography of the worlds oceans. 3. 13.1 The Oceans Composition Salinity Salinity is the total amount of solid material dissolved in water. Because the proportion of dissolved substances in seawater is such a small number, oceanographers typically expresssalinity in parts per thousands. Most of the salt in seawater is sodium chloride,common table salt. 4. Where does the Salt come from? Salinity Sources of Sea Saltrocksa. Chemical weathering of on the continents is one source of elements found in seawater. b. The second major source of elements found in seawater is from Earths interior. 5. Processes Affecting Salinity Salinity Processes Affecting Salinity Processes that decrease salinity: - Precipitation - Ice melting - Icebergs melting - Runoff from landincrease salinity: Processes that - Evaporation- Formation of sea ice 6. Natural Processes Affecting Salinity 7. 13.1 Seawater Ocean Temperature Variation The oceans surface water temperature varies with the amount of solar radiation received, which is primarily a function of latitude. Temperature Variation with Depth The thermocline is the layer of ocean water between about 300 meters and 1000 meters where there is a rapid change of temperature with depth. The thermocline is a very important structure because it creates a barrier to marine life. 8. Variations in Ocean Surface Temperature 9. Variations in Ocean Water Temperature 10. 13.1Factors Affecting Seawater DensityOcean Density Variation Density is defined as mass per unit volume. It can be thought of as a measure of how heavy something is for its size. Factors Affecting Seawater Density Seawater density is influenced by two main factors:salinityandtemperature. 11. The 5 Oceans on EarthAunt Patty Seldom Ate Inchworms What?Atlantic Pacific Southern Artic Indian 12. The 5 Oceans on Earth 13. The 5 Oceans on Earth The continents divide the 5 major oceans and the equator subdivides these oceans into the North Atlantic Ocean and South Pacific OceanOn average, the Atlantic is the saltiest of the world's major oceans; 14. Technology: Exploring the Ocean Floor 1. How can scientists study the ocean floor? 2. What did they find? 3. With state of the art technology, scientists have discovered a wide variety of landforms and sea life on the ocean floor. 15. Underwater Explorer Some parts of the ocean are too deep for humans and so they must use special underwater equipment. One piece is a minisub called Alvin. Alvin has been used tosearch for sunken ships, recover lost hydrogen bombs, and explore landforms on the ocean floor. 16. Viewing the ocean floor with sonar SONAR (sound navigation and ranging) is a technology based on the echo-ranging behavior of bats. We can measure the oceans depth with SONAR by sending high frequency sound waves to the ocean floor. The sound bounces off the ocean floor and back to the boat. The time it takes to get back to the boat can be use to find the depth. Depth = t/2x1500m/s 17. Draw and label the Topography of the Ocean Floor And circle the deepest feature 18. Congratulation OceanographeGo back to ikeepbookmarks Review a concept then summarize your findings