1. which of the following are anthropogenic sources of acid rain?
volcano emissions, lightning, and microbial processes
industrial emissions and other man-made polluters
smokestacks and volcano emissions
microbial processes and fuel combustion
2.monuments, statues, and bridges are generally not impacted by erosion from acid deposition.
true
false
3.which of the following are natural causes of acid rain?
volcano emissions, lightning, and microbial processes
industrial emissions and other man-made polluters
smokestacks and volcano emissions
microbial processes and fuel combustion

1) industrial emissions and other man-made polluters
3) volcano emissions, lightning, and microbial processes

B.a pop up at ion changes in response to a change in the environment.

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].