10 points! what is the rate of change formula for earth science?

Change in field value divided by time I think

Hausa,  Rwanda

Explanation:

Rwanda is a country in central Africa and is one of the smallest country of Africa and is located to the south of the equator and has a climate of temperate to subtropical and has great African lakes and is high in elevation. While the Yoruba is an ethnic society that lives in western Africa and consists of the 44 million people. Most of this population is from Nigeria and they are among the most urbanized people of Africa. Hausa group states are interconnected by the influences of the Niger and Benue river between the empires  west are found in the northern parts of the country