Longitudinal Waves: Linear Sound Waves, Acoustic Energy and Intensity, Simple Sound Sources, Nonlinear Effects in Sound Waves (Shock Waves) and in Long Waves in Channels (Hydraulic Jumps), Transverse Waves in Homogeneous and Isotropic Systems: Water Waves, Dispersion Relation, Initial Value Problem, Asymptotic Behavior, Group Velocity and Energy Propagation, Transverse Waves in Nonhomogeneous and Anisotropic Systems: Internal Gravity Waves, Effects of Nonhomogeneity, Wind Shear and Variable Brunt-Vaisala Frequency, Steady Streaming Generated by Wave Attenuation.