Ocean water is made up of a few important things:

• Salts, such as sodium chloride (table salt)
• Dissolved gases, like oxygen and carbon dioxide
• Nutrients, which include nitrogen and phosphorus

These components are really important because they:

1. Change how heavy the water is and how it moves.
2. Impact the pH levels, which can influence the health of sea creatures.
3. Provide essential nutrients for phytoplankton, the tiny plants that are the foundation of the ocean food chain.

In short, keeping the right balance of these elements is crucial for supporting different types of life in the ocean.