The majority of earthquakes worldwide occur at all but one location. that is a)at tectonic plate boundaries. b)where sediments deposit and form new layers. c)where plates stick and then jump past each other. d)where an ocean plate slides under a continental plate.

Consider an insulating crystal, made up of layers of atoms. what form would you expect the temperature dependence of the phonon heat capacity to approach at extremely low temperatures if the interlayer coupling is i)very strong (rigid coupling), and ii) very weak. explain.