up·heav·al 
/ˌʌpˈhi:vəl/ noun
plural up·heav·als /ˌʌpˈhi:vəl/ noun 1 : a major change or period of change that causes a lot of conflict, confusion, anger, etc. [noncount] ▪ The civil rights movement marked a period of social upheaval in the U.S. ▪ the emotional upheaval of divorce [count] ▪ a period of cultural and social upheavals 2 technical : an occurrence in which a part of the Earth's surface moves up forcefully [count] ▪ The island was created by an upheaval of the ocean floor. [noncount] ▪ The lake was formed by geologic upheaval.
