Dust, like the dust that accumulates on furniture, falls at a rate that doesn’t vary too much for each location. When someone drops an object, dust starts to accumulate over time. Over a very long time the dust turns into dirt and the object gets buried. Historians can measure how deeply an object is buried and tell at what time period it was dropped. Not all locations have dust build up at the same rate. They figure out what the rate of build up is by comparing how deeply the object was buried compared to how deeply similar objects in other locations were buried.
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