Final answer:
The chemical composition of seawater is influenced by the atmosphere, marine organisms, minerals, and ocean sediments, all of which interact to shape the ocean's chemistry.
Step-by-step explanation:
The chemical composition of seawater is affected by multiple factors including the atmosphere, marine organisms, minerals, and ocean sediments. These components interact and contribute distinctly to the overall composition of the ocean.
The atmosphere plays a critical role through the exchange of gases, such as carbon dioxide (CO2), which dissolves in water to form ionic compounds like calcium carbonate (CaCO3). Marine organisms selectively absorb elements from seawater, which can make certain elements more detectable. In addition, oil spills and substances such as humic acids and Gelbstoffe also contribute to the organic matter present in the ocean, potentially affecting the organic carbon content and overall seawater chemistry.