Fires are classified according to:
a. the type of structure involved
b. the severity of the fire
c. the location of the fire
d. the type of fuel feeding the fire

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onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.