In order to assign a Richter magnitude to an earthquake event, a scientist would have to measure the waves on a seismogram. a. secondary
b. surface
c. primary

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;