Glencoe Earth Science

Chapter 21: Our Impact on Water and Air

Calculate Percentages

1
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an decrease in nitrogen over a 10-year period?

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A)15%
B)11.1%
C)7.85%
D)13%
2
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an decrease in sediment over a 10-year period?

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A)2.9%
B)12.1%
C)15%
D)11.11%
3
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an increase in bacteria from sewage over a 10-year period?

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A)2.87%
B)5.1%
C)12.1%
D)13%
4
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an increase in total phosphorus over a 10-year period?

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A)12.1%
B)5.12%
C)13%
D)15%
5
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an decrease in total phosphorus over a 10-year period?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078778026/161752/m520_001a_866621.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>

A)12.1%
B)21.95%
C)15%
D)13%
6
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an increase or decrease in sediment over a 10-year period?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078778026/161752/m520_001a_866621.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>

A)15%
B)12.1%
C)12.96%
D)22%
7
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an increase or decrease in bacteria from sewage over a 10-year period?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078778026/161752/m520_001a_866621.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>

A)15.97%
B)13%
C)2.9%
D)12.1%
8
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown a decrease of sediment and bacteria from sewage over a 10-year period?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078778026/161752/m520_001a_866621.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>

A)15%
B)5.6%
C)2.9%
D)12.08%
9
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an increase in total phosphorus and nitrogen over a 10-year period?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078778026/161752/m520_001a_866621.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>

A)15%
B)12.1%
C)5.57%
D)22%
10
This table shows the number of sampling stations that have an increased or a decreased level of pollution in a 10-year period. What percent of stations has shown an increase or decrease in nitrogen over a 10-year period?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::::/sites/dl/free/0078778026/161752/m520_001a_866621.gif','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (8.0K)</a>

A)13.95%
B)12.1%
C)13%
D)22%
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