What is the universal definition of terrorism ?

The U.S. Code of Federal Regulations defines terrorism as "the unlawful use of force and violence against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof, in furtherance of political or social objectives"

Explanation:

answer; gravity pulls glaciers down hill and as glaciers flow it pick up rocks and soil;

answerpeople organize large projects such as levee-building;