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Rocks vary in hardness and can be ordered from soft to hard, as is shown in the following table.
rocks of as many different kinds as you can find. Number the rocks, and
make a list of the numbers. Now, to determine which rocks are hardest
and which are
If you can learn the names of the rock-types you have collected and tested for hardness, then you can list granite (for example) as being harder than sandstone.
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