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Transcript
What are ocean currents? How does a letter in a bottle thrown into the ocean in Africa travel to South America? Currents which are streams of water flowing in the ocean. Types of Currents… Currents Density Currents (Deep) Convection (Vertical) Surface Currents (Horizontal) What is the effect of salinity and temperature on the density of water? Why does the density of water increase as its TEMPERATURE decreases? Why does the density of water increase as the SALINITY increases? Density Currents… Differences in density can cause currents to move up and down in the ocean depths. Differences in temperature and salinity cause density currents. Ocean currents can be warm (near the Equator) or cold (near the Poles) Remember Convection Warm substances (air, water, or magma) rise and cooler substances sink because of density! This causes vertical currents. Surface Currents… Wind causes most horizontal surface currents. Earth’s rotation causes the winds to curve. What is this called? CORIOLIS EFFECT.