Correlation is the matching up of similar fossils found in distant locations.

Lithologic

Explanation:

As correlation is trying to fit the sedimentary strata found in distant places and the geologist tries to found out the relative age the widespread use of the strats and they are especially in different  the layers and there might be the transgression and the regression of the rocks as the fossil is important for doing the long distances and the  certain geophysical methods are needed for this as the electrical method and

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].

The answer is d if you are on edgenuity.