Both compressional and extensional forces act along convergent boundaries. Differential stresses causing compressional deformation in the Sevier thrust were greater than 150 MPa. Density is also related to elastic parameters through velocity equations for compressional and shear waves. These shear loads subject the structure to both tensile and compressional loads. Uplift and compressional deformation took place as the Neotethys continued to close. Large overthrust faults occur in areas that have undergone great compressional forces. Subsidence will generally warm an air mass by adiabatic (compressional) heating. The ridge is an anticline, formed as a result of compressional geological folding. Subsidence will generally dry out an air mass by adiabatic, or compressional, heating. In general, subsidence will dry out an air mass by adiabatic or compressional heating. The resultant compressional forces produce mountain ranges. In general, subsidence will dry out an air mass by adiabatic, or compressional, heating. Gravitational forces could be even important in certain cases during emplacement of compressional thrusts. Primary waves (P-waves) are compressional waves that are longitudinal in nature. Higher altitudes are cooler than lower altitudes due to differences in compressional heating.