Why are fisheries heavily impacted by ENSO events? a. Upwelling ...

[DelorasTo]

Why are fisheries heavily impacted by ENSO events?
  a. Upwelling ceases
  b. Nutrient-rich currents are interrupted when the trade winds shift
  c. Low pressure systems create downwelling events rather than the normal upwelling
  d. Rise in sea level effects migration patterns

Question 2

What is used to visualize ocean layering?
  a. A caballing chart
  b. A circulation histogram
  c. A layering table
  d. A temperature-salinity diagram

[eliasc0401]

Answer to Question 1

ANS: B
The northward flow of nutrient-rich waters is interrupted by warm water masses with little nutrients.
Some upwelling does still occur, but there are no nutrients to bring to the surface. Information can be
found in the section Marine Scientists Use the Logic of Science to Study the Ocean.

Answer to Question 2

ANS: D
There are many combinations of temperature and salinity that can yield the same density. Layers in the
ocean are dictated by density. Water masses with the same density but different temperature and
salinity can combine to produce a new water mass with greater density. Information can be found in
the section Thermohaline Circulation Affects All the Ocean's Water