It was caused by a mix of different scenarios. Rome was constantly attacked by Barbarian tribes; they were over-expanded, which made it really hard for them to keep their entire empire under control; they had a lot of economic problems and relied too much on slave labor; and they spent way too much money on their military, just to name a few factors.
Answer:
mountains
Explanation:
When plates move toward each other, they generally produce mountains. Where they move apart, there are rift valleys.
The Indian plate is moving northward relative to the Eurasian plate, so produces mountains.
B.rely on wind power rather than electricity
The Indus valley thrived between 4000 and 1500 BC
