Ocean chemistry refers to the study of chemical processes and substances in the ocean, including their interactions with marine life and the environment. It involves understanding how various chemicals, such as nutrients, salts, gases, and pollutants, are cycled through the water, air, and living organisms that make up the ocean ecosystem. This field of study is important for understanding the health of our oceans, predicting changes in marine life due to climate change or human activities, and developing strategies to protect and preserve this vital resource.