How does a high-pressure belt get formed near a 30° parallel? Why does this region have hot deserts?
Formation of a high-pressure belt near 30° parallel:
- The heated air from the equatorial region becomes lighter, starts ascending, and after reaching higher latitudes, moves towards the polar region i.e. towards the North and South pole.
- Due to low temperatures at the higher altitude, the air cools down and becomes heavier.
- Thus heavier air descends down in both the hemispheres in the region between 25° and 35° parallels.
- This leads to the formation of high-pressure belts in both hemispheres. In this way, a high-pressure belt gets formed near a 30° parallel.
Reasons for the region near 30° parallel having hot deserts:
- The air in the mid-latitudinal high-pressure belts (between 25° and 35° parallels in both the hemispheres) is found to be dry.
- The amount of water vapour is found to be very low in dry air. Hence, this region gets extremely scarce or no rainfall.
- Consequently, this region has hot deserts.
Concept: Pressure Belts on the Earth’s Surface - Effects
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