The line graph shows how the average carbon dioxide concentration in the atmosphere has changed over 60 years. What does the trend of the plotted line show?
Question 1 Report
The line graph shows how the average carbon dioxide concentration in the atmosphere has changed over 60 years. What does the trend of the plotted line show?
Answer Details
Read the plotted line from left to right. Every point sits higher than the one before it, and the steps between the points are similar in size, so the concentration has climbed steadily across the whole 60 year period with no reversal at any stage.
On these axes the vertical scale is carbon dioxide in parts per million and the horizontal scale is the year, so a line rising to the right means the concentration is increasing. A rise then a fall would need the line to turn downwards somewhere, which it never does. A steady fall would need a line sloping down to the right, and no change would give a flat horizontal line. Describe a graph by the direction of its line.
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