Final answer:
The strong Belt-Zone circulation is observed in the atmospheres of the gas giant planets Jupiter and Saturn, influencing their weather patterns. Jet streams play a significant role in this circulation.
Step-by-step explanation:
The strong Belt-Zone circulation is observed in the atmospheres of the gas giant planets Jupiter and Saturn. This circulation is influenced by underlying east-west wind patterns in the atmosphere, which remain consistent over many decades. Jet streams, such as the eastward-flowing jet stream at Jupiter's equator and the strong equatorial jet stream at Saturn, contribute to the Belt-Zone circulation.