Is the rock suitable?
More Testing
You found that:
After 10 minutes B had soaked up the most water.
After 20 minutes A had soaked up the most water.
Does this mean that A is better at soaking up water than B? How could you be sure?
put sample A in water for a bit longer and then weight it again
leave both samples of rock in water for another 10 minutes and then weigh both again
leave both samples on a paper towel for 10 minutes and then weigh both again
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