Geography

Cyclones are also termed atmospheric disturbances. When the velocity of winds increases to such an extent that they attain strong force, a cyclonic storm is formed. Cyclones are the centres of low pressure. They are surrounded by closed isobars having increasing pressure outward. The wind circulation is from outside towards the central low pressure. They … Read more

Anticyclones are centres of high pressure.They are surrounded by closed isobars having decreasing pressure outward.  The circulation is from central high pressure towards the periphery in such a way that air blows outwards in a clockwise direction in the Northern hemisphere and anticlockwise direction in the southern hemisphere. Due to Coriolis force, blowing winds are … Read more

. It is an inclined zone along which two opposing air masses having contrasting characteristics in terms of air temperature humidity density pressure converged together.  An extensive transitional zone between two converging air masses is called a frontal zone. The frontal zone is inclined at a low angle to the Earth’s surface. It is also … Read more

Air mass is a large body of air having little horizontal variation in temperature and moisture.The air masses have a relatively uniform distribution of vertical gradients in their physical properties like temperature, pressure, and humidity. Air masses are formed in very particular surface and atmospheric conditions which are found only in a few areas of … Read more

Cyclonic rain occurs due to the convergence of extensive air masses. When two contrasting air masses like cold polar air mass and warm westerly air mass coming from opposite directions converge along a line a front is formed. The warm wind is lifted upward along this front where the cold air being heavier settles down. … Read more

Permanent winds are also called invariable or planetary wind systems because they blow over larger areas of the earth. They blow in the same direction throughout the year. Trade Winds These flow from subtropical high-pressure belts to equatorial low-pressure belts in both hemispheres north and south. These are known as Northeast trade winds in the … Read more

. These winds change their directions with the seasonal changes or periodically. Monsoon Winds A monsoon wind is a seasonal wind found especially in Asia that reverses direction between summer and winter and often brings heavy rains. The Asiatic monsoon is the result of the interaction of both the planetary wind system and regional factors, … Read more

India lost a large proportion of cotton growing area to Pakistan during partition. However, its acreage has increased considerably during the last 50 years. Cotton is a tropical or sub-tropical crop grown in semi-arid areas of the country (mainly in the Deccan Plateau).  Hard-frost is injurious to cotton cultivation and it requires at least 210 … Read more

Solar storms are caused by the release of magnetic energy called solar winds from the sunspots. These storms result from variations in the solar wind that cause major changes in the currents, plasmas, and fields in Earth’s magnetosphere.  Solar Storms happen when Sun emits large bursts of energy in the form of solar flares and … Read more