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circle graph
a circle graph is the best graph to use for that!!
double-bar graph
A bar graph is best to compare the levels because you can have 6 different color bars connected on a graph to compare the lead contamination levels.
any number
histogram
I suppose you are doing this for a science progect :D The best graph to use in your situation is a line graph. A line graph shows data along a period of time, and your bean plants grew over a period of time. If you did different sets of data like one bean plant got no radiation, one got some, and one got a lot, then mark each one across the line graph in different colors for each one. The colors should be dark and easy to see.
a bar graph
A line graph is the best graph.
histogram
Pie Chart
The best graph for the purpose of comparing raw numbers between different qualitative categories would be a bar graph or some variation thereof.
circle graph
I believe a bar graph is best, and could be easily understood by children. It can be quickly made in Excel (Win), Numbers (Mac) or Gnumeric (Linux).
Circle graph
A stacked bar graph would be a suitable choice to display the amount of iron ore in four different countries. This graph allows you to compare the total amount of iron ore in each country as well as the distribution of iron ore production within each country.
circle graph