Most graphs have a few basic parts: a caption or introduction paragraph，a title，a legend or key and labeled axes. An active reader looks at each part of the graph before trying to interpret the data. Captions will usually tell you where the data came from(for example，a scientific study of 400 African elephants from 1980 to 2005). Captions usually summarize the author's main point as well. The title is very important. It tells you the main idea of the graph by stating what kind of information is being shown. A legend，also called a key，is a guide to the symbols and colors used in the graph. Many graphs，including bar graphs and line graphs，have two axes that form a corner. Usually these axes are the left side and the bottom of the graph. Each axis will always have a label. The label tells you what each axis measures.

　　Grade Earned

　　Graph 1. Students Performance On

　　Social Studies Quiz

　　Bar Graphs

　　A bar graph has two axes and uses bars to show amounts. In Graph 1，we see that the x－axis shows grades that students earned，and the y－axis shows how many students earned each grade.You can see that 6 students earned an A because the bar for A stretches up to 6 on the vertical measurement. There is a lot of information we can get from a simple graph like this(See Graph 1)．

　　Line Graphs

　　A line graph looks similar to a bar graph，but instead of bars，it plots points and connects them with a line.It has the same parts as a bar graph—two labeled axes—and can be read the same way.To read a line graph，it's important to

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