A region of the earth is in isostatic equilibrium when A. the tectonic plates aren't present in the subduction zone.
B. the lithosphere and asthenosphere stop competing with one another for plate movement.
C. granitic and basaltic rock have different densities that promote movement.
D. the floating force from the asthenosphere is balanced with gravity.

Asquare 1m x 1m plate is shown below. all four of its edges are kept at 0 co. at t=0the temperature distribution is given by: y xtsins n75)=.a) using separation of variables determine the temperature distribution t(x,y,t)along the plate at any time t.b) discretize the heat conduction equation +=22222 txtusing a second-order centered difference scheme for the two second derivatives and a first-order forward euler scheme for the first derivative. using von neumann stability analysis, determine the stability criterion for the proposed discretization scheme in terms of , hand t. solve for the maximum allowable time step tmax