All of the following are factors that affect metamorphic processes except

a. temperature.
b. deposition of new layers of sediment.
c. pressure.
d. mineral composition of the parent rock.

All of the given are factors that affect "metamorphic processes" except "deposition of new layers of sediment".

Explanation:

The chemistry of metamorphic rock is same as its parent rock. Example quartz will metamorphose into silica. Limestone will metamorphose into calcium rich rock. Temperature and pressure are the important factors which affect metamorphic processes. Minerals are formed under different temperatures and pressures. The chemical reactions also occur at various temperatures during metamorphism.  

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].