Chapter 1. Bar Graphs
Part A: Background
Impaired waters are those that have recurring water quality issues – in other words, they are chronically in violation of the Clean Water Act.
As this map shows, a significant portion of the water bodies in the United States fall within this definition.
Part B: Examine the Data Set
The EPA has identified the leading causes of impaired surface waters in the United States as:
| Cause of Impaired Water | Number of Impaired Bodies of Water |
|---|---|
| Pathogens | 10,457 |
| Metals (excluding mercury) | 7,462 |
| Nutrients (Nitrogen, Phosphorus) | 6,998 |
| Hypoxia | 6,498 |
| PCBs (industrial pollutant) | 6,352 |
| Sediments | 6,255 |
| Mercury | 3,930 |
| pH (too high or too low) | 3,744 |
| Pesticides | 1,874 |
Part B: Examine the Data Set
| Cause of Impaired Water | Number of Impaired Bodies of Water |
|---|---|
| Pathogens | 10,457 |
| Metals (excluding mercury) | 7,462 |
| Nutrients (Nitrogen, Phosphorus) | 6,998 |
| Hypoxia | 6,498 |
| PCBs (industrial pollutant) | 6,352 |
| Sediments | 6,255 |
| Mercury | 3,930 |
| pH (too high or too low) | 3,744 |
| Pesticides | 1,874 |
Question 1.1
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PufiPwddfe/8VEpIA4BHoPcrAmk8FjAwn6inegDULHrK1Si1fCB1ztLQwIVwVJU5aIZl163msnORqy3I9Qv/6OTOqv4Tc/1qY67yxGtMfqF0ovtMJkS8/5IWKlVxaXXIU+IstdWhzxTUqa4WrnamT6ZD0p98Zdj9rhamp3qIdU4P6vsdSJmayB58v/aEObbzYbqblIR+mZAsuEq5oeVoYm3dnMpgbKX9RXwHx9S9TnfBACitgK5DiZoylUhlfI3eTQ+CQ74cwZFJ3PoaqnwaibFGC8LTWPhCG3SM6fAerU5soAJ3Ob5YRwDZcYFXr6ctoQ8P0fRXIpq1WAMl1UZP9mtw3bGCu1k420H/rQ8Jq9wgGChxWDunzTM9iTkfyOOEoCX4Mc3gDA+74d9f4PdSIA==Part C: Build the Graph
Instructions: Create a graph below. Label the X axis as “Causes of Impaired Water”, and label the Y axis as “Number of Impaired Waters in the United States”. Then give the chart a relevant title and input the data below into the graph. OMIT COMMAS in the numerical values when entering them in the graph.
| Cause of Impaired Water | Number of Impaired Bodies of Water |
|---|---|
| Pathogens | 10,457 |
| Metals (excluding mercury) | 7,462 |
| Nutrients (Nitrogen, Phosphorus) | 6,998 |
| Hypoxia | 6,498 |
| PCBs (industrial pollutant) | 6,352 |
| Sediments | 6,255 |
| Mercury | 3,930 |
| pH (too high or too low) | 3,744 |
| Pesticides | 1,874 |
Part C: Build the Graph
Bar graphs can be displayed in more than one way. They can be constructed vertically, like the one you just made, or horizontally like this:
In this example, the entire graph is rotated, so the X and Y axis labels are switched.
Part D: Apply Skills
Infographic 16.4 shows the relative amounts of nitrogen from the atmosphere and fertilizer that enters the soil and eventually runs off into nearby water bodies in three different types of watersheds.
Question 1.3
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XjpAAMwo51IebclwhAxGYVwL6vGHdwSmITfu21zZtflqGXLck+CRLoUPuwuh0+Ug3RYk//1kLKujtySO0/FUutHjLhOA8+JWO6sBDnzV/Ff64+RzEMd6cKvZn2Xt6/blJzKfuJr3+/Q21KbcLDetfivZA3SoiKhw5DZztLjSspptNBcvc3MvgUX9WhIRo6K/msynW8WuT1MYFkRpCd8EJyyuMc8QwWji94kxR138KYxKe+1grIERLfkhq6Hx1npslxaJNywhaMwkN3+eeYDWtB+w4E4ppA3rlmtm/1hq6VMaQhTybLqUuwpBpgD685jW3WLRAaSJ4G/ZdJVMwA7X2eOgDAo=Part D: Apply Skills
Question 1.5
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