At a depth of 7 km in the ocean, the pressure is 71.6 MPa. Assume a specific weight of seawater at the surface of 10.05 kN/m3 and an average bulk modulus of elasticity of 2.34 GPa for that pressure range. Find (a) the change in specific volume of water between the surface and 7-km depth, (b) the specific volume at 7 km, (c) the specific weight at 7 km.