Earth's 6 8 10 12 20 sea level 40 -60 80 12.2 12 8 4 6 8 10 12 00-, 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 howartuakeergy propagates through earth 's interior have developed ways of recognizing the places wherc that energy is reflected off of boundaries where the upper layer is less dense than the lower laycr. this phenomenon is like the reflection of a beam of light ott of a reflective surface. the langer the difterence between layer densities across a boundary. the more prominent the reflcction of carthquake energy will be. 1. figure a1.7.2b shows a plot of the approximate variation in density with depth in earh's interior arranged so thal its vertical wcale is the samc as the radius of the section through harth ia fig. a1.6.2a. circle the largest jump in deusity in fig. a1.7.28. 2. at what depth does the largest density jump occur in earth's interior as depicted in fig. a.1.7.2bkm 3. acrass the boundary between which two layers docs this large density jump occur less dense layer more dese layer: c reflect & discuss rays indicating the paths of scimic waves through earth due to a single earhquake that occurred near the top of fig. a1.72a are shown in light blue on that figure. desc ile how山e shapes of the light bite ray paths relate (if at all) to the various boundaries you drew in seci a4 aud to the boundaries indicated in the density plot in fig. a1.7.20. d reflect & discuss as earth was forming in its eafiest history and probably when the collision that resulted in the formation of the moon occurred more than 4 billion ycars ago, earth was a blob of molten rock with just a thin solid ilm on its outer surface. given your experience with materials of dresities, what can you infer about the rclative densities of earth's atmosphere, ocean, rocky crust and mante, and iron-rich core? 36