What’s the key point in this What does this mean???

Why are electrons transferred

rubbing two solids together often results in static charge so there must be something (electrons) on the outsides of atoms which can be transferred as atoms collide

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

you gotta add the following molecules so we can give u an answer

explanation: