Turner_et_al_1993.pdf Landscape equilibrium in its truest sense is defined as a landscape that is constant over time and does not exhibit any spatio-temporal dynamics. Landscapes are rarely, if ever, in true equilibrium though. Explain why not. Several alternative concepts of landscape equilibrium, or stability, have been developed. Describe each of these concepts and the conditions under which landscapes may be considered in equilibrium under each one. Under what conditions would a landscape be considered to be in disequilibrium? (Hint: see the Turner et al. 1993 paper posted on D2L, and consider figure 7.16 in your text).