Which of the following countries had the longest civil war? Liberia
Ethiopia
Democratic Republic of Congo
Angola

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Explanation:

Angola had the longest civil war

Option (a)

The impending independence of one of those colonies, Angola, led to the Angolan civil war that grew into a Cold War competition. ... The National Union for the Total Independence of Angola (UNITA), an offshoot of the FNLA, was led by Jonas Savimbi and supported by the country's largest ethnic group, the Ovimbundu

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