Temperature of Southern Ocean:
The temperature of the Southern Ocean is typically around 0.2 degrees Celsius, which is just above the freezing point of seawater.

Boiling Point of Water:
Water boils at 100 degrees Celsius at sea level under normal atmospheric pressure. When the temperature of water reaches this point, it changes from a liquid state to a gaseous state, creating steam.

Explanation:
Despite the temperature of the Southern Ocean being much lower than the boiling point of water, it can still appear to "boil" due to various factors such as geothermal activity and underwater volcanic vents. These vents release extremely hot water and gases into the ocean, causing the surrounding water to heat up significantly.

Effects of Geothermal Activity:
Geothermal activity can raise the temperature of the water in specific areas of the Southern Ocean, creating localized hotspots. These hotspots can reach temperatures well above the boiling point of water, creating the appearance of boiling water.

Underwater Volcanic Vents:
Underwater volcanic vents release molten rock and gases into the ocean, heating up the surrounding water rapidly. The water near these vents can reach temperatures exceeding 100 degrees Celsius, resulting in boiling-like conditions.

Conclusion:
In conclusion, while the average temperature of the Southern Ocean is relatively cold, geothermal activity and underwater volcanic vents can cause localized areas to reach temperatures that exceed the boiling point of water. This phenomenon creates the illusion of the ocean boiling, despite its overall cold temperature.