Rocks {Ans: A naturally formed aggregate, or mixture, of minerals; have varied chemical compositions}Worldwide immigration {Ans: }U.S.Civil War {Ans: also called War Between the States, four-year war (1861-65) between the United States and 11 Southern states that seceded from the Union and formed the Confederate States of America. https://www.britannica.com/event/American-Civil-War}cellular respiration {Ans: Process that releases energy by breaking down glucose and other food molecules in the presence of oxygen}World War 1 (1914-1918) {Ans: }Distance and Distance Formula {Ans: The length of a path between two points D=square root of (x2-x1)2+(y2-y1)2}