Primary Waves: Primary waves (P-waves) are compressional waves that are longitudinal in nature. Hence, Statement 1 is incorrect. P waves are pressure waves that travel faster than other waves through the earth to arrive at a seismograph. These waves can travel through any type of material, including fluids as well as solid. They travel faster than S-waves. Secondary Waves: Secondary waves (S-waves) are shear waves that are transverse in nature. Hence, Statement 2 is incorrect. S-waves can travel only through solids, as fluids (liquids and gases) do not support shear stresses. S-waves are slower than P-waves.