Although the oceans cover most of Earth, the the tiny sliver of the coastal ocean greatly influences, and is most influenced by, human activity.
Oceanic cycles—chemical, physical and biological—are related to cyclic processes in the Earth’s atmosphere, such as the seasons, El Niño events, and long-term climate changes.
The understanding of chemistry in the ocean is critical because changes can influence marine life, and in turn, human life.
Ocean currents and water properties play large roles in Earth's climate and ecosystems.
The complex connections of these two systems are responsible for Earth's weather and climate.