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RECAP: Ocean Currents

RECAP: Ocean Currents. “Motion in the Ocean”. Ocean Currents – The Motion in the Ocean. Ocean Currents are the movement of surface water in the oceans. OCEAN CURRENTS IN THE WORLD VIDEO. Ocean Currents in the World. Ocean Currents near Nova Scotia. What Causes Ocean Movement?.

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RECAP: Ocean Currents

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  1. RECAP: Ocean Currents “Motion in the Ocean”

  2. Ocean Currents – The Motion in the Ocean • Ocean Currents are the movement of surface water in the oceans. OCEAN CURRENTS IN THE WORLD VIDEO

  3. Ocean Currents in the World

  4. Ocean Currents near Nova Scotia

  5. What Causes Ocean Movement? • Wind (Drift Currents) 2. Density - Temperature differences in the water (Convection Currents) 3. Density - Salinity differences (amount of salt) in water 4. The gravitational force from the moon & sun 5. Coriolis Effect

  6. 1. Wind (Drift Currents) • Wind blowing across the surface of the ocean waters pushes water forward. • Wind affects mainly the top layer of the ocean (the ocean surface).

  7. 2. Density - Temperature Differences • When the ocean waters heat up, they become less dense. • This warmer/less dense water moves above the cooler water, and gives off its heat to the surrounding environment. • As the warm water cools, it begins to sink, and the process begins again.

  8. 3. Density - Salinity Differences • Salinity is the amount of dissolved salt in water • High salinity = A lot of salt dissolved in water • Low salinity = Not a lot of salt in water • Water with high salinity is more dense, while water with low salinity is less dense. • Water with higher density (more salt) will sink to the bottom of the ocean, while water with lower density (less salt) will rise to the top of the ocean. VIDEO DEMONSTRATION

  9. 4. Gravitational Force from Moon & Sun • The gravity from the moon and the sun pull on the ocean waters, causing ocean currents to flow in many different directions depending on the time of day and month.

  10. 5. Coriolis Effect • From the earth’s rotation • Causes freely moving objects (such as water, airplanes, etc) to steer toward the right in the Northern Hemisphere and to the left in the Southern Hemisphere. VIDEO DEMONSTRATION

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