FIG. 2.

Contour of the Gibbs energy of polymerization of 2Gly to GlyGly as a function of pressure and temperature (solid lines) and expected temperature profiles of Europa's ice crust with 40 km thickness (dashed lines) and 100 km thickness (dotted lines). Surface radius of the moon is 1565 km. Ice viscosity at the melting point is assumed to be 10¹⁵ Pa s (thick lines) and 10¹⁴ Pa s (thin lines). Hydrostatic pressure corresponding to a depth from the surface of Europa is shown on the right axis (assuming density of 920 kg m⁻³ and gravity of 1.31 m s⁻²).