Calculate the pressure difference, due to surface and interface movements, in either layer of a two-layer model. Here the density in the upper layer is 1=1020kgm^-3, and the density in the lower layer is 2 = 1025 kgm^-3. Each layer is about 125m deep. Point A at Sea surface at USSL. (i.e. as well as the surface of upper layer). Point B at Sea surface down 20cm = 0.2 m. (i.e. Point B is 0.2m lower than Point A). Point C at Interface at UIL (i.e. Point C is at the connecting face between the upper and lower layer). Point D at Interface up 40m. (i.e. Point C is 40 m higher than Point C). How does the pressure at A compare to the pressure at B? A. the pressure at A is much higher than the pressure at B. B. the pressure at B is much higher than the pressure at A. C. the pressure difference between A and B is very small compared to the pressure difference between C and D. (very small means less than 10% of)