Paleoceanography is the study of the history of the oceans and their interaction with the atmosphere, land, and biosphere over geological timescales. Researchers in this field use a variety of techniques, including analysis of sediments, fossils, isotopes, and other proxies to reconstruct past ocean conditions, such as temperature, salinity, currents, and carbon dioxide levels. By studying the past, paleoceanographers can better understand how the oceans have influenced climate change, evolution of marine life, and the overall Earth system. This interdisciplinary field combines elements of geology, chemistry, biology, and oceanography to provide insights into the complex and interconnected processes that shape our planet's oceans.