Question

Using the phosphorus data from the table, calculate the percentage of each phosphorus source that enters the Mississippi from the city of St. Paul.

Answer 1

Answer/Explanation:

% of each Nitrogen source = amount of Nitrogen from each source/total amount if Nitrogen × 100

% of Nitrogen from atmospheric deposition:

`(1,300)/(7,400)*100 = (130,000)/(7,400) = 17.57`

Approximately 18%

% of Nitrogen from household pet waste:

`(2,100)/(7,400)*100 = (210,000)/(7,400) = 28.38`

Approximately 28%

% of Nitrogen from residential fertilizer:

`(3,800)/(7,400)*100 = (380,000)/(7,400) = 51.35`

Approximately 51%

% of Nitrogen from weathering:

0%

% of Nitrogen from county compost:

`(200)/(7,400)*100 = (20,000)/(7,400) = 2.70`

Approximately 3%