Which of the following factors was most important in controlling the distribution of copper mines in the u. s. versus iron mines in the great lakes region

The factor that was most important in controlling the distribution of copper mines in the u.s. versus iron mines in the great lakes region were: different ages and geologic histories of the rocks.

Explanation:

United States, especially North America is very well known for the copper mines where as iron mines in the great lakes region is for the mining of iron.It was very important for them to control the mining process because the ages of the raw materials were contrasting. Similarly the the history and the geography of rock also aided for the factor in the mining process.

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].

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