In the electron cloud model of the atom, an orbital is defined as the most probable(1) charge of an electron
(2) conductivity of an electron
(3) location of an electron
(4) mass of an electron

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).

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.