Volume of an irregulary shaped object?

Answer:
Water Displacement Method-- put the object in a graduated cylinder with water in it and subtact the water level without the object from the water level with the object. For example, I fill the graduated cylinder to 500 mL. I put the rock in and it reads 720 mL. 720 mL - 500 mL = 220 mL. The rock has a volume of 220 mL.
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