is the water temperature different in different rivers or lakes?
Your first guess would be that a
river or lake in the northern part of the United States would be
colder than a river or lake in Texas. That is a good guess
and, in general, is true.
However, there are other factors
besides location that determine water temperature. The type
of soil and rocks in the area can affect temperature. The
source of the water is also important. Does the water in the
river or lake come from snow melting, an underground aquifer, or
simply rain water draining from the lands next to the river or lake?
If you have ever been tubing on
the Guadalupe River or the Rio Frio in Texas, you will know that
the water in these rivers stays cool even during the hottest summer
days. These rivers are actually colder than some rivers in
down this stream!