What are the major differences between oceans and seas?

Oceans and seas are both large bodies of saltwater that cover a significant portion of the Earth's surface. However, there are several major differences between them.

1. Size: Oceans are much larger than seas. Oceans are vast bodies of water that cover about 71% of the Earth's surface, while seas are smaller and usually found partially enclosed by land.

2. Depth: Oceans are generally deeper than seas. The average depth of the oceans is around 12,080 feet (3,682 meters), while seas tend to be shallower, with an average depth of around 790 feet (240 meters).

3. Connectivity: Oceans are interconnected and form a continuous body of water, whereas seas are partially enclosed by land. Oceans are connected to each other through various waterways, such as the Atlantic, Pacific, Indian, and Southern Oceans. Seas, on the other hand, are usually connected to oceans through narrow passages or straits.

4. Salinity: Oceans and seas have varying levels of salinity. Oceans generally have a higher salinity level due to their larger size and limited freshwater input. Seas, being partially enclosed, can have varying salinity levels depending on factors such as freshwater inflow, evaporation, and oceanic currents.

5. Biodiversity: Oceans are known for their high biodiversity, supporting a wide range of marine life due to their vast size and diverse ecosystems. Seas, although smaller, can also have significant biodiversity, but it may be more influenced by local environmental conditions and connectivity to the open ocean.

6. Human Activities: Oceans and seas are both important for human activities such as transportation, fishing, and tourism. However, due to their larger size and connectivity, oceans often play a more significant role in global trade and transportation. Seas, being partially enclosed, may have more localized economic activities and tourism.

In summary, the major differences between oceans and seas lie in their size, depth, connectivity, salinity, biodiversity, and human activities. Oceans are larger, deeper, interconnected, and generally have higher salinity levels, while seas are smaller, partially enclosed, and can have varying salinity levels. Both oceans and seas are vital for sustaining marine life and supporting human activities, but their characteristics and functions differ due to their distinct geographical features.