20 sea level. 40 -5.6 -9.9 60 -12.2 80 -12.8 more dense 4 6 8 10 12 100-earth's center put the point of the drafting compass here density (g/cm) figure a1.7.2 b seismologists who study earth's deep interior by modeling how earthquake energy propagates through earth's interior have developed ways of recognizing the places where that energy is reflected off of boundaries where the upper layer is less dense than the lower layer. this phenomenon is like the reflection of a beam of light off of a reflective surface. the larger the difference between layer densities across a boundary, the more prominent the reflection of earthquake energy will be. 1. figure a1.7.2b shows a plot of the approximate variation in density with depth in earth's interior arranged so that its vertical scale is the same as the radius of the section through earth in fig. a1.6.2a. circle the largest jump in density in fig. a1.7.2 2. at what depth does the largest density jump occur in earth's interior as depicted in fig. a.1.7.28 3. across the boundary between which two layers does this large density jump occur? km more dense layer: . less dense layer: nuak that a8ed au uo (uu) suajal l lil ul