No.
No.
No.
No.
The Roman Empire collapsed because it was taken over by incoming peoples from Eurasia. They hastened this by admitting large numbers of these migrants. There is a lesson here for today's Europe.
Glowing cloud sections that will eventually become stars are protostars. These protostars are clouds of interstellar gas and dust, which gradually collapse causing a hot dense core to form and evolve into a star.
Your leg gave out because the muscles or nerves in your leg may have become weak or injured, causing it to suddenly give way or collapse.
No :|
Darkrai sabotaged the tower somehow, it never quite mentioned how he did it, or how he was distorting the fabric of space later on. But what he did to the tower set a series of events in motion that caused Dialga to become deranged, and would eventually cause the tower to collapse and the planet to become paralysed.
Erosion occurs, causing the cliffs to wear down over time. This process can cause the cliffs to become more unstable and eventually lead to landslides or rockfalls. Over time, the cliffs can change shape or even collapse.
Yes, Ancient Rome's bureacracy (government) did become too top heavy. The Roman government kept hiring soldiers for the military. When this happened, the soldiers had to be paid, so taxes would increase. Eventually, causing Rome's government to become too top heavy and collapse. Emperor Diocletian made administrative changes which greatly increased the size of the imperial bureaucracy so as to gain a more autocratic control over the empire. However, Constantine I trimmed the bureaucracy as it had become grossly oversized, too expensive and undermined the cities as many of their administrators had left the cities to join the imperial bureaucracy. The size of the army was a financial burden, but it did not lead to collapse as such. The collapse of the empire was due to a complex range of factors. A large army was needed to defend the vast frontier of the empire which stretched from France all the way to Syria. The Romans found it difficult to cope with this and a pattern of legions sent to areas under attack leaving other areas vulnerable to raids developed. Barbarians near the frontier raided the areas left exposed and would withdraw or get defeated by the returning Roman legions. To deal with this situation more efficiently, emperor Galienus developed a cavalry-only force which acted as a rapid deployment force to be sent to the troubled areas. When the pressure on the empire grew again towards the end the western empire, the Romans resorted to enlisting Germanic soldiers or hiring Germanic mercenaries in order to cope One historian sees the size of the army as having contributed to the fall of the empire by leading d to a tax burden that weakened the peasantry. Another historian sees the political power of the army and the many civil wars between leaders of different legions as the contributing factor, rather than size as such. I am inclined to take the latter view as an army succesful in battle could provide the revenue of loot. The number of times the Roman army was defeated increased in the final period.
Liquefaction is when the ground soil is mixed with the ground water, causing the soil to become less stable and lose its strength. As it loses its strength, the building will sink into the soil and tilt, in some cases collapse. hope i helped :)
Clouds of gas will collapse, under certain circumstances, due to their own gravity. These will eventually become stars. This process is described in more detail in the Wikipedia article on "Protostars".