Historical geologyHistorical geology or palaeogeology is a discipline that uses the principles and methods of geology to reconstruct the geological history of Earth. Historical geology examines the vastness of geologic time, measured in billions of years, and investigates changes in the Earth, gradual and sudden, over this deep time. It focuses on geological processes, such as plate tectonics, that have changed the Earth's surface and subsurface over time and the use of methods including stratigraphy, structural geology, paleontology, and sedimentology to tell the sequence of these events.
Géologie marinevignette|Âge et répartition de la croûte océanique terrestre vignette|Lave en coussins d'un volcan sous-marin à Hawaii. La géologie marine ou géologie océanique est une discipline de l'océanographie étudiant l'évolution du plancher océanique et des zones côtières. Elle utilise les mêmes outils que la géologie à terre : la géophysique, la géochimie, la sédimentologie et la paléontologie. La géologie marine est étroitement liée à l'océanographie physique. vignette|left|Carte des principales plaques tectoniques terrestres.
Dental cementDental cements have a wide range of dental and orthodontic applications. Common uses include temporary restoration of teeth, cavity linings to provide pulpal protection, sedation or insulation and cementing fixed prosthodontic appliances. Recent uses of dental cement also include two-photon calcium imaging of neuronal activity in brains of animal models in basic experimental neuroscience. Traditionally cements have separate powder and liquid components which are manually mixed.
