Interpreting Graphs and Data (ch 2) Flashcard Example #33246

What information is presented on the y-axis of the graph?

time, measured in 20-year intervals

the amount of nitrogen added to Earth’s ecosystems each year

the amount of nitrogen stored in Earth’s ecosystems

the amount of nitrogen humans add to Earth’s ecosystems each year

the amount of nitrogen added to Earth’s ecosystems each year
What is the natural rate of nitrogen fixation in Earth’s ecosystems?

2020 teragrams of nitrogen per year
100 teragrams of nitrogen per year
100 kilograms of nitrogen per year
2020 kilograms of nitrogen per year

100 teragrams of nitrogen per year
What does the red graph line represent?

input of nitrogen from burning fossil fuels

input of nitrogen from fertilizer and industrial processes

input of nitrogen from all human activities

input of nitrogen from legumes grown on farms

input of nitrogen from all human activities
In 1960, what was the total amount of nitrogen released by human activities?

about 50 kilograms
about 270 teragrams
about 50 teragrams
about 25 teragrams
about 25 kilograms

about 50 teragrams
During which period did the total amount of nitrogen released by human activities increase most rapidly?

1920-1940
1940-1960
1960-1980
1980-2000
2000-2020

1960-1980
Which factor was the major contributor to the rapid increase in the total human input of nitrogen between 1960 and 2000?

a rapid increase in the amount of legumes grown on farms

a rapid increase in the natural rate of nitrogen fixation

a rapid increase in the use of fossil fuels

a rapid increase in fertilizer use and industrial processes

a rapid increase in fertilizer use and industrial processes
Is the following statement supported or not supported by the data shown in the graph?

In the year 2000, the total human input of nitrogen into Earth’s ecosystems was almost twice the natural rate of nitrogen fixation.

supported
not supported
cannot be determined from the graph

supported
Is the following statement supported or not supported by the data shown in the graph?

By the year 2100, the increasing use of fertilizer will cause the total human input of nitrogen into Earth’s ecosystems to be about three times the natural rate of nitrogen fixation.

supported
not supported
cannot be determined from the graph

cannot be determined from the graph

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