WILL GIVE BRAINLIEST NEED ASAP According to the density gradient model, the MOST densely packed part of the city is

closest to the city core
in the first ring
in the second ring
in the third ring
in the suburbs

explanation:

since the crust is readily accessible, scientists have been able to perform hands-on experiments to determine its composition; studies on the more distant mantle and core have limited opportunities samples. so scientists also rely on analyses of seismic waves and gravity and as well as magnetic studies.