Concrete is the most common artificial composite material of all and typically consists of loose stones (aggregate) held with a matrix of cement. Concrete is a very robust material, much more robust than cement, and will not compress or shatter even under quite a large compressive force.
2) Y-axis contains absolute brightness Why do astronomers use the H-R Diagram? Astronomers use H-R Diagrams to classify stars and to understand how stars change over time.
You can add a âplayâ axis to a scatter or bubble chart, too, to view data as it changes over time. More about Bubble and scatter charts in Power View. Line, bar, and column charts. Line, bar and column charts are useful for comparing data points in one or more data series. In line, bar, and column charts, the x-axis displays one field and the y-axis displays another, making it easy to see the relationship between the two values for all the items in the chart.