The Displacement Method

 The displacement method is a way to find the volume of irregular objects. Let's say you have a lump of hardened clay. To find the volume of the clay, fill a graduated cyloinder with water and measure how high the water level is and figure out what do the incremants go by. The incraments are what the tiny measuring lines are for. Once the water has been measured accurately take the object you are finding the volume for and drop it in the water. The amount of water that went up is the volume of the clay.