Question

Q. Consider the following pressure belts:

Which of the pressure belts given above are dynamically induced belts?

• A. 1 and 4 only
• B. 2 and 3 only
• C. 2 and 4 only
• D. 1 and 3 only

Answer 1

The correct option is C 2 and 4 only

Explanation:

The pressure differences that result in high and low-pressure systems have two major causes: thermal and dynamic.

Thermally-induced pressure belts:

• When air is heated, it expands and rises as a convection current causing low pressure to develop. Cooling, on the other hand, causes contraction, leads to high pressure.
• Equatorial low and polar highs are examples of thermal lows and thermal highs

Dynamically induced pressure belts:

• The formation of pressure belts can also be due to dynamic controls arising out of pressure gradient forces and rotation of the earth (Coriolis force).
• subtropical high and sub-polar low-pressure belts are formed due to dynamic factors like pressure gradient forces, apparent movement of sun and rotation of the earth (Coriolis force)