What event occurred right before the constitutional convention that scared the elites into rewriting the constitution?

Apart from severe economic troubles generated by ther articles of confederation, one of the troubling events was Shay's rebellion which occured in 1787, casued by high taxes in Massachusetts. The local rebellion lead by Daneil Shay used violence to close several local courts as well as challenge the supreme court of Massachusetts  to prevent foreclosure and debt processing. The rebellion was eventuallt halted and stopped by the militia and thus showed the failings of the articles of confederation. This even showed that a strong federal government was necessarily to prevent and contain such events as Shay's rebellion. This was one of the principle reasons the Articles of Confederation was rewritten into the Consitution of the United States.

which of the following is a subsurface event that takes place during the rock cycle?