Read these steps and then follow them for the exercise
below:
Click the text below the picture for a larger version of the
map, and keep it open.
Print this page, so you'll have it before you go to the next
screen.
Click the question below the table to go to the next page. Multiply
the appropriate values in the table on this page by the values
in the table on the next page. For example: subarea 1 is agricultural.
So you would multiply 1.81 (the measurement of the area) by .50
(constant for agriculture). The result will be the amount of nutrients
the subarea contributes to the river.
Click on the number of the subarea you think is contributing
the most nutrients to the river.
