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Do you float better in fresh or salty water? Explain in complete sentence why this may be.

April 8 Learning Log. Do you float better in fresh or salty water? Explain in complete sentence why this may be. Essential Question How is the density of water affected by heat and salinity?. April 9 Learning Log.

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Do you float better in fresh or salty water? Explain in complete sentence why this may be.

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  1. April 8 Learning Log Do you float better in fresh or salty water? Explain in complete sentence why this may be. Essential Question How is the density of water affected by heat and salinity?

  2. April 9 Learning Log Knowing that salt water is more dense than freshwater, describe the impact that you think this has on the oceans? Think about and then write your thoughts down about what impact temperature has on water in terms of density. Essential Question How is the density of water affected by heat and salinity?

  3. Water Density

  4. Essential Question How is the density of water affected by heat and salinity?

  5. What percentage of the Earth’s surface is covered by oceans? 71%

  6. Earth has five oceans…… Antarctic or Southern Ocean

  7. Which one is the largest? Covers 30% of surface of the Earth

  8. Which one has the longest distance north to south?

  9. Which one is mostly in the southern hemisphere?

  10. Which one is the smallest? And mostly in the Northern Hemisphere

  11. Seas: are smaller than oceans and are partly or mostly landlocked.

  12. Origin of the Oceans Scientists hypothesize that Earth’s water could have originated from two sources: • Volcanism • Comets

  13. Ocean water is a mixture of gases and solids dissolved in water

  14. Constituentsof Seawater Which two substances are the most abundant in seawater? Chloride, Cl Sodium, Na

  15. What is salinity? • A measure of dissolved solids (salts)in water • Expressed as grams of salts/ kilogram of water or parts per thousand(ppt) • Sometimes measured in PSU (practical salinity units) using electrical conductivity • Avg. salinity of seawater is 35ppt or 3.5 %

  16. Salt is naturally added to and removed from seawater. • Salt added to sea by • Volcanic eruptions • Erosion of rocks which dissolve in water • Salt is removed from sea by • Sea spray • Marine organisms • Formation of evaporites (chemical rock)

  17. Factors affecting salinity…..

  18. RERUN Water Salinity Density Lab RECALL: Summarize what was done in the lab demo. EXPLAIN: Explain the purpose of the lab RESULTS: Describe the results of the lab UNCERTAINTIES: Describe what you are still unsure about NEW: Write at least two new things that you learned from this lab

  19. Temperature OCEAN LAYERING • Ocean water has the ability to absorb sunlight which heats the water • Factors that affect the temperature: • Latitude • Depth • Shore proximity

  20. RERUN Water Temperature Lab RECALL: Summarize what was done in the lab demo. EXPLAIN: Explain the purpose of the lab RESULTS: Describe the results of the lab UNCERTAINTIES: Describe what you are still unsure about NEW: Write at least two new things that you learned from this lab

  21. Density Two factors affect density: • Salinity Halocline – layering of ocean water due to different salinity levels) • Temperature Thermocline– layering of ocean water based on different temperatures

  22. Answer the Essential Question in your learning log

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