Final answer:
Temperature and salinity are two factors that can cause changes in the volume of water in the ocean.
Step-by-step explanation:
The two factors that can cause the volume of water in the ocean to change are temperature and salinity.
Temperature: When water gets heated, it expands and takes up more space, leading to an increase in volume. Similarly, when water cools, it contracts, reducing its volume.
Salinity: Saltwater is denser than fresh water. Therefore, an increase in salinity can cause the water to become denser and occupy less volume. Conversely, a decrease in salinity can make the water less dense, resulting in an increase in volume.
Learn more about factors affecting volume of ocean water