Millions of years ago, the area pictured was the site of a mountain range. Today, a few plateaus are all that remain. What can be said about the remaining rock forms? A.
Only the weakest portions of the rock remain.
B.
Due to a lack of rainfall in the area, rain is not a factor in the erosion process.
C.
The rock has been worn down due to continental drift.
D.
The remaining forms consist of the hardest rock.

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].

Answerscripps institution of oceanography; i believe this is correct plz check first good luck;