Question

Define
a) External forces
b) Western disturbance
c) Erosion
d) Isobars​

Answer 1

Explanation:

(a) External forces are forces caused by external agent outside of the system.

(b)western disturbance is an extratropical storm originating in the Mediterranean region that brings sudden winter rain to the northwestern parts of the Indian subcontinent. It is a non-monsoonal precipitation pattern driven by the westerlies.

(c)Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water.

(d)a line on a weather map that joins places that have the same air pressure at a particular time

Answer 2

Answer:

Western Disturbance

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A western disturbance is an extratropical storm originating in the Mediterranean region that brings sudden winter rain to the northwestern parts of the Indian subcontinent.[1][2] It is a non-monsoonal precipitation pattern driven by the westerlies. The moisture in these storms usually originates over the Mediterranean Sea, the Caspian Sea and the Black Sea.[3][4] Extratropical storms are a global phenomena with moisture usually carried in the upper atmosphere, unlike their tropical counterparts where the moisture is carried in the lower atmosphere. In the case of the Indian subcontinent, moisture is sometimes shed as rain when the storm system encounters the Himalayas. western disturbances are more frequent and strong in winter season.



A Western Disturbance over Northern India and Pakistan in November 2012

Western disturbances are important for the development of the Rabi crop (রবি শস্য) , which includes the locally important staple wheat.[5][6]