Exploitation from oceans is not limited to biological processes, geological events have main role in oceans generation and extinction, plate tectonics discusses the cycle of oceanic crust.
   Erosion of terrestrial terrains, sediment transportation to sea and sedimentation is continuous geological cycle works during time. Weathering, erosion, sedimentation and digenesis caused numerous kinds of sedimentary rocks and some type of deposits, which are available on sea floors. These sediments could be accreted to continents during subduction process and these cyclic events will act dynamically. 97% of whole hydrosphere is in oceans and seas and, water cycling in hydrosphere is the cause of many geochemical changes during weathering, solids transportation and solutions transfer. Solid sediments, which are transported from land to seas, are various. Among them silicate minerals, such as silica and clays are important because of their contribution with heavy minerals and metals in deposition. Decomposition of these sediments could distribute some elements in water.
   So study of sea floor sediments, water, heavy minerals and mineral potentials of coast lines is one of the goals of marine geology which could be utilized indirectly in other branches of science, like deciphering good places for marine animals growth and generation.