The mean field approximation predicts that the average magnetization m is determined by where z is the number of nearest neighbors. (a) find the critical temperature te (b) show that the critical exponent for the magnetization is 1/2 .. (c) show that the internal energy is give by where n is the number of spins. (d) find the energy at b = 0 and t = 0, compare the result with the exact value. (e) find the energy for t > 「. is the result realistic?

Which of these statements best explains how the hydrosphere interacts with the atmosphere to affect global climate? mountains block rain clouds and cause changes in global rainfall and evaporation. humans burn fossil fuels to produce greenhouse gases which cause global warming. humans cut down trees which affects the amount of oxygen in different parts of the globe. greenhouse gases, like carbon dioxide, dissolve in oceans and prevent global warming.