In order to design a device that minimizes the effects of the collision between the pillow and the pail, the students identified the forces that would occur during the collision. A)The pillow exerts an equal and opposite force on the pail B) The pail exerts an unequal force on the pillowC) The pillow exerts a frictional force on the pail D) The pail exerts a gravitational force on the pillow

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.

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).