Currents 4/13/15 14-1a pgs. 364-367 IN: What do you think causes ocean currents?

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Currents 4/13/15 14-1a pgs. 364-367 IN: What do you think causes ocean currents?

Terms and Objectives: Terms: Surface currents coriolis effect deep current upwelling el nino Objectives: Describe surface currents and list three factors that control them. Describe deep currents. Illustrate the factors involved in deep-current movement. Explain how currents affect climate.

Earth’s oceans 71% of the earth’s surface is covered with water There are four main oceans

Earth’s oceans Earth’s oceans are very salty

Earth’s ocean currents Surface Currents – streamlike movements of water that occur at or near the surface of the ocean.

Earth’s ocean currents Controlled by 4 factors: Global Winds The Coriolis Effect Continental Deflections Temperature

Global Winds Surface currents near the equator flow from east to west but currents near the poles flow from west to east.

The Coriolis Effect The Earth’s rotation causes surface currents to move in curved paths rather than in straight lines.

Continental Deflections When surface currents meet continents, they deflect, or change direction.

Temperature Warm-water currents carry water away from the equator and cold-water currents carry water away from the poles. N. Pole Equator S. Pole

Great Ocean Conveyor Belt

Finding Nemo?

OUT: If there were no land on Earth’s surface what might the pattern of the surface currents look like? (Draw a Diagram)