Globes usually don't distinguish between
fresh water and salt water, everything is colored blue! But there
is a big difference between salt and fresh water. We cannot drink
salt water and you certainly would not want to wash clothes or your hair
in it. Fresh water is the fluid that our body needs. Discuss
with students that most of the fresh water bodies are small and form lakes
or rivers. Fresh water needs to have newly precipitated water to
be salt free. Older lakes, like the Great Salt Lake in Utah,
have more evaporation than precipitation and are considered salt lakes.
- Give students inflatable
globes and have them locate different water masses. Make a list on
the board as they tell you if a water mass is fresh or salty. The
list should look similar to the one below.
| Lake Superior,
Lake Huron, USA
Lake Erie, USA
| Pacific Ocean
Salt Lake, Utah
- Students may have trouble
reading the oceans, seas, and lakes but it’s never too young to learn geographic
locations. You may want to tell students that ice is only made of
water without the salt. The ice in the Arctic and Antarctica is salt free.
- You may want to point out the 4 major
oceans including the Atlantic, Pacific, Indian, and Arctic. Remember
that the limits of the oceans are arbitrary, as there is only one global
- Students may ask what are the smaller
salty water areas called. The term sea is used to refer to smaller
bodies of salt water like the Mediterranean Sea or the Red Sea. However,
historically the term sea can also mean the larger oceans.
The “Seven Seas” refers to bodies of water known to explorers in
the fifteenth century.
- The worksheet shows the eastern part
of the United States. Instruct students to color the fresh water
lakes (the Great Lake region) a different color blue than the Atlantic
Ocean which is salt water. Color the land brown or green and have
them label Atlantic Ocean, Gulf of Mexico, and Great Lakes. A gulf is a
protected arm of an ocean.