Equilibrium global temperature and CO₂ partial pressure for an Earth-like planet as a function of time with land-based and seafloor weathering, with W_L0 = W_S0 = 1/3. The outgassing rate decays exponentially with an initial value G₀ = 5 times the current rate. The green curves show a case with weathering temperature dependence θ_L = θ_S = 4 K. The purple curves show the case with θ_L = θ_S = 30 K.