Interpreting Graphs and Data (ch 2) – Flashcards

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

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

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

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

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

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

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

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