Which of the following statements is true regarding cyclones ?

Correct Answer: Warm air rises and low pressure is created.

Explanation:

To understand the formation of a cyclone, we need to examine how air temperature and air pressure interact with each other.

1. Expansion and Density of Warm Air:
When air gets heated by solar radiation or warm ocean waters, it expands, becomes lighter (less dense), and begins to rise into the atmosphere.

2. Creation of Low Pressure:
As the warm, warm moist air rises upward away from the surface, it leaves less air behind near the ocean/ground surface. This region with reduced atmospheric air density experiences a drop in pressure, forming a central region of low pressure (often referred to as the "eye" or low-pressure center of a cyclone).

3. Inflow of Cooler Air:
Surrounding cooler, denser air rushes in from high-pressure areas to fill this low-pressure void, creating strong, spiraling wind patterns associated with cyclones.

Therefore, the fundamental mechanism driving cyclones is that warm air rises, leading to the creation of a low-pressure area.