Line graphs
Line graphs show how data changes over time or space. The line graph above displays the changes in world population growth over time. The x-axis shows time or distance. When describing a line graph, you should include: -
- A trend or change over time.
- The pattern of the line showing an increase or decrease.
- The rate of change, shown by the steepness of the line.
Multiple line graphs
Multiple line graphs show more than one line, making it easier to compare different data sets on the same graph.
This graph has three lines showing three different data sets on the same graph. The general trends are an increase in the global demand for energy and renewable energy, and a decrease in the supply of fossil fuels between the year 2000 and 2050.
Question
Compare the global demand for energy, supply of fossil fuels and demand for renewable energy between 2000 to 2050.
Hints
- split the graph into different sections to identify patterns
- quote years and figures to support your points
- use descriptive terms like moderate increase, sharp or rapid increase, sharp or rapid decrease
- identify the overall trend from 1800 -2100 e.g has the population increased or decreased in this time period?
- ensure you mention all three factors shown in the graph
- remember to quote figures and years.
The global demand for energy has increased in the time period. It has moderately increased from 100 PW hours in 2000 to approx. 275 in 2050. (1 mark)
The demand for renewable energy has sharply increased in the same time frame from approx. 25 PW hours in 2000 to approx. 260 in 2050. (1 mark)
However, the demand for fossil has decreased between 2000 to 2050 from approx. 90 PW hours in 2000 down to 10 in 2050 (1 marks)
