 Objective:
 Learn how ocean
currents move heat
around the Earth
 Agenda:
 Textbook pages 519-524
answer questions 1-6
 Ocean Notes continued
 Ocean Current
Worksheet
 Review for Test
 Homework:
 All work is due
tomorrow for 2nd MP
 Test Tomorrow… STUDY!
Salinity
The amount of salt per unit water is known as salinity.
NaC but there
The most abundant salt in seawater is ________,
are many other salts present in the form ofl ions.
The average salinity of seawater is _____
35 ppt. Therefore, for every
1,000 ml water, there are ___ grams35of dissolved salts.
Near the equator salinity is __________
lower
than average due to
greater precipitation
___________________.
lower
Near the poles salinity is __________
than average due to
melting sea ice
_______________.
higher
In the Mediterranean the salinity is __________than
average due to __________.
evaporation
The salinity
here would
likely be:
A. 35 ppt
B. 34 ppt
C. 36 ppt
http://www.ldeo.columbia.edu/dees/ees/climate/slides/sal_march.gif
•http://ingrid.ldgo.columbia.edu/
 What makes the ocean
water in the picture to the
left different colors?
differences in depth
 Why would a shrimp that
appears bright red at the
surface appear black at
greater depths, and why
might this be beneficial?
Longer (red) wavelengths are
absorbed before reaching deep
water. Shrimp can hide and
not become a meal.
Label the three ocean layers in the diagram below.
Surface layer
Thermocline
Bottom layer
Listed below are some of the major surface currents. The force
wind
which generates these currents is ____________.
 Transport ~ 20% of
latitudinal heat
 Equator to poles
 Transport nutrients and
organisms
 Influences weather and
climate
 Influences commerce
http://www.ldeo.columbia.edu/dees/ees/climate/slides/sst_march.gif
Chapter Review
1. What is the average salinity of seawater?
35 ppt
2. What is the deepest area of the seafloor?
trench
3. What is the largest ocean?
4. Why is the ocean “blue”?
Pacific
shorter wavelengths not absorbed
5. What is the force responsible for surface currents?
6. What causes density currents?
wind
differences in temperature and
salinity
7. Name the ocean that borders Virginia.
Atlantic