The theory of plate tectonics states that the earth’s surface is divided into large sections called the (this is a project, there aren't any answer choices.)

The answer is ; Tectonic plates

The plates sit above the ‘plastic’ mantle and move due to the convection currents in the underlying mantle. There are approximately 7 major tectonic plates of the lithosphere. Where some of these plates collide is called a convergence/ destructive boundary while where they move away from each other is called a divergent/constructive boundary.  

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e