1. strong or violent change or disturbance, as in a society: the upheaval of war.
2. an upward warping of a part of the earth’s crust, forcing certain areas into a relatively higher position than
1. strong or violent change or disturbance, as in a society: the upheaval of war.
2. an upward warping of a part of the earth’s crust, forcing certain areas into a relatively higher position than