4.3. Oceans

Try these first

1. 1.

   What is molecular diffusion?

   Hint

   Think about how sugar spreads in tea.

2. 2.

   What is bulk flow?

   Hint

   Consider how water moves in a river.

3. 3.

   What primarily drives bulk flow in oceans?

   • Temperature differences
   • Wind
   • Salinity

   Hint

   Consider what natural forces can move water.

4. 4.

   True or False: Molecular diffusion occurs only when there is movement in water.

   • True
   • False

   Hint

   Think about diffusion processes in stagnant conditions.

5. 5.

   A pollution plume is detected in a river undergoing a flood. Compare the rate of transport due to bulk flow versus diffusion in this scenario. How would you model this transportation?

   Hint

   Consider the equations used in fluid dynamics.

6. 6.

   Design an experiment to measure the diffusion rate of a dye in both still water and flowing water. What variables will you control and measure?

   Hint

   Think about the impact of flow on diffusion distance over a set time.