As we know there is a brand belt on which the army tanks move the belt provides more area to the tank and as we know area is inversely proportional to the pressure. So the increase in the area decreases the pressure . Hence smoothing it's move even on a earthen road.
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Because it's tyres are designed in such a way that it's surface area is very large and we know that pressure is inversely proportional to area so it easily move on earthen track
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