A third possibilty is that IVC colapsed primarily due to natural reasons (climate change, tectonic activity along the subduction zone along the Indo-Asian plate boundary) and that there was no Indo-Aryan invasion that took place.

• 印度河流域文明衰落的第三个可能是由于自然因素（气候改变，伴随着印度雅利安人进入的可建造区域减少），并没有印度雅利安人入侵的发生。