Iron - rich minerals in rock pointed in one direction and then switched to the exact opposite direction. this supports what idea? a. the rocks were being turned around. b. earth's magnetic field stopped working entirely. c. earth's magnetic field goes through pole reversals. d. being underwater makes the rocks respond to magnetic fields.

The answer i think is d

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].

Yeah, i guess that checks out because the unused brain is almost like a clean slate or a new car. it has more value than an older already used brain. -thomasnash