Is the rock suitable?
So the idea is you stand both samples in water to see which will hold the most liquid.
Measuring
How would you find out which sample had soaked up the most water?
Which of these methods would be best? Read them carefully before you decide.
Weigh the samples before you put them in the water, and again afterwards
When you take them out the water use a magnifying glass to see which has the most water in it
As you take each sample out of the water, stand it on a paper towel and see which towel gets wettest
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