Which of the following statements is not a part of the theory of plate tectonics? A. Plates float on top of the Earth’s mantle.

B. The Earth’s plates never move.

C. Tectonic activity happens at plate boundaries.

D. The Earth’s crust is composed of many plates.

Please select the best answer from the choices provided

A

B

C

D

Earths place in space 

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].

Answerscripps institution of oceanography; i believe this is correct plz check first good luck;