What are dangerous river-like currents in the ocean called?

The term for dangerous river-like currents in the ocean is indeed "Rip Current." These currents are powerful, narrow channels of water that flow away from the shore, formed when water pushed onto the beach by waves returns to the ocean. Their strength can vary, but they are known for being very hazardous to swimmers, as they can quickly pull individuals away from the shore. Understanding rip currents is crucial for beach safety, as they can lead to serious accidents or drownings if swimmers are not aware of how to recognize and deal with them.

In contrast, underflow currents refer to deeper water movement below the surface and do not specifically relate to the dangerous conditions found near coastlines. Jet streams are fast flowing air currents in the atmosphere rather than water currents and are not associated with oceanic movement. Surface currents, while part of ocean circulation, generally refer to the movement of water at the surface layer due to wind and do not have the same current characteristics or dangers associated with rip currents.