The correct option is They generally move from east to west..
Explanation
Tropical cyclones are intense low-pressure systems that originate over warm tropical oceans. Their movement, or "track," is primarily steered by the general circulation of the atmosphere (planetary winds) prevailing in the latitudes where they form.Analysis of Movement:
- Influence of Trade Winds: Tropical cyclones form in the tropical latitudes (roughly between 5° and 30° North and South). The prevailing planetary winds in this region are the Trade Winds (Tropical Easterlies), which blow from the east to the west. These winds steer the cyclones generally from east to west.
- Recurvature: As tropical cyclones move poleward and reach higher latitudes (subtropical regions), they may come under the influence of the Westerlies. At this stage, they often "recurve" and move towards the north-east (in the Northern Hemisphere). However, their initial and primary movement within the tropics is westward.
- Comparison with Temperate Cyclones: They generally move from west to east. describes the movement of Temperate (Extra-tropical) Cyclones. These form in the mid-latitudes (35°-65°) and are steered by the Westerlies, causing them to move from west to east.
- Poleward Movement: Tropical cyclones generally move away from the equator (poleward), not towards it. The Coriolis force, which is essential for the cyclone's rotation, is zero at the equator and increases towards the poles.
Key Takeaway:
Tropical cyclones are steered by the Trade Winds, moving them from East to West, whereas Temperate cyclones are steered by the Westerlies, moving them from West to East.