1. NOTES! Salinity is the amount of dissolved substances in water
What affects the density of water?
Temperature and Salinity

2. How does density affect the ocean?
Ocean water has formed layers according to density
Low-density water occurs near the surface
Higher-density water occurs below
CHALLENGE QUESTION: From the video, is high-density water warm or cold?

3. Importance:
Moves drifting organisms from place to place – plankton, disperse young
Carries eggs and larvae of organisms that have external fertilization
Brings food, oxygen
Carries away waste,
pollutants

4. Thermohaline Circulation (currents)
Causes deep ocean circulation
Vertical currents
Temperature and salinity cause water density differences
Due to density differences, water masses rise and fall

5. Thermohaline Circulation (currents)
↑ salinity = ↑ density = water mass sinks
↑ temp. = ↓ density = water mass floats