Calling: Earth.

  In this fourth lightning interview, Ray Johnston, a masters/soon to be doctoral student in the USF School of Geosciences, discusses his time on an International Ocean Discovery Program (IODP) cruise and his geochemical work on the rocks collected from that cruise.    More about Ray can be found here: https://www.researchgate.net/profile/Raymond_Johnston   Calling: Earth is a production of the USF Libraries in cooperation with the USF School of Geosciences. Questions, comments, and any other feedback can be directed to callingearth@usf.edu.