In the earth's mantle, heat is transferred in large convection currents. within these currents, a.  cooler rock rises and hotter rock sinks. b.  hotter rock rises and cooler rock sinks. c.  hotter and cooler rock sink but do not rise. d.  cooler and hotter rock rise but do not sink.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

it would be kevlar ^^