Hydrology-groundwater
<span>Geophysics-structure of the subsurface </span>
<span>Seismology-earthquakes </span>
<span>Petrology-rock types </span>
<span>Sedimentology/Stratigraphy-layering, deposition </span>
<span>Structure-faults and folds </span>
<span>Minerology-minerals </span>
<span>Paleontology-ancient life </span>
<span>Geomorphology-landforms </span>
<span>Glaciology-glaciers </span>
<span>Geodynamics-inner workings/physics of the earth </span>
<span>Economic-mining </span>
<span>Petroleum-oil, natural gas etc. </span>
<span>Enviornmental-groundwater cleanup</span>
Eukaryotic and Prokaryotic cells
My answer would be radiation.