The andes in western south america are an example of a landform that arises from the what

The Andes in western South America are an example of a landform that arises from the tectonic plates that have moved through time due to volcanic activities. The effect of such movement resulted to the subduction of oceanic crusts beneath the South American plate.The Andes is the tallest mountain range outside of Asia. 

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].