The main source of energy for tropical cyclones is the warm oceans in the tropical regions. To initiate a tropical cyclone the sea-surface temperature generally needs to be above 26.5Â°C.However, existing cyclones often persist as they move over cooler waters.eproduced with permission from BoM. The main source of energy for tropical cyclones is the warm oceans in the tropical regions. To initiate a tropical cyclone the sea-surface temperature generally needs to be above 26.5Â°C. However, existing cyclones often persist as they move over cooler waters.
Oolong tea contains caffeine. Caffeine works by stimulating the central nervous system (CNS), heart, and muscles. Oolong tea also contains theophylline and theobromine, which are chemicals similar to caffeine. Too much oolong tea, more than five cups per day, can cause side effects because of the caffeine.
Oolong tea caffeine occupies a sweet spot between green tea and black tea. This may come as a surprise to many people. Oolong tea is semi-fermented, so many people assume that its caffeine content lies between that of green tea (which is unfermented) and black tea (which is fully fermented). Contrary to what many people believe, tea fermentation does not increase caffeine, it slightly reduces it.