textbook

Math Skills
Learning Activity 2

2-1: Graph Reading

This is a graph with an x axis along the bottom and a y axis that runs vertically. The x axis on this graph shows the years, from 1900 to the present. The y axis shows temperature variations measured in degrees celsius.

Scientists used a thirty year period from 1961 to 1990 to establish that they call normal. That 30 year average is the comparison point and is represented by a horizontal line at zero degrees.

For example, the year 1900 was 0.8°C cooler than the 1961 to 1990 average.

The graph from page 79.