Self-similar solution 6 Basal tractions 4 Density of liquids 4 Differential equations 4 Landforms 4 Lithospheric 4 Mountain belts 4 Mountain building 4 Nonlinear differential equation 4 Nonlinear equations 4 Theoretical result 4 Two layers 4 Two-layer systems 4 Upper mantle 4 Axisymmetric flow 2 Circular cavity 2 Eigenvalues 2 Eigenvalues and eigenfunctions 2 Governing equations 2 Gravitation 2 Gravity currents 2 Gravity waves 2 Integral curves 2 Liquids 2 Lubrication approximations 2 Nonlinear eigenvalue problem 2 Numerical integrations 2 Numerical methods 2 Phase plane 2 Physical variables 2