Equilibrium of the Earth

Earth - A nice picture of one side of earth with the sun glowing past.
@momus8 (92)
January 23, 2007 11:46am CST
We were talking about in Geography, about how the earth always wants to acheive equilibrium, and i asked a question of Why? Why does it want to do that, and how does it do it, and why will it never reach equiblirium? Could someone here tell me?
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