Tnpsc and Upsc Notes Pdf
Factors affecting speed and direction of wind Due to atmospheric pressure, the air is set in motion. This is called Wind. This wind flows from a high-pressure area to low pressure area. Apart from the air pressure, the rotation of the earth also influences the rotation of the earth. The force exerted by the rotation … Read more
Atmospheric pressure There is an uneven distribution of temperature, on the surface of the earth. This is because of the heating and as a result, the air expands and gets compressed on cooling. Due to the compression and expansion of Air, variations occur in the atmospheric pressure. This variation in atmospheric pressure is the cause … Read more
Major crops of Tamil Nadu Agriculture is and continues to be the important sector of Tamil Nadu’s economy. Around 60% of the total population of the state is engaged directly or indirectly in agriculture and its allied sectors. Tamil Nadu has around seven agro-climatic conditions and different soil conditions. That is suitable for the growth … Read more
Mettur Dam The Mettur Dam was constructed in a gorge, where river Cauvery enters the plains. Mettur Dam is one of the oldest dams in India. It provides irrigation to Salem, erode, karur, tiruchirappalli, thanjavur, tiruvarur and Nagapattinam. It irrigates 2,71,000 acres of farms. It also serves as Park, Major Hydroelectric power stations, and important … Read more
Inversion of temperature in Geography Usually, the temperature decreases as the elevation increases. It is known as the Normal Lapse Rate. Sometimes, this situation is reversed and the Normal Lapse Rate is inverted. It is called Inversion of Temperature in Geography. It is the rate at which an atmosphere variable, the normal temperature in the … Read more
Distribution of Temperature The global distribution of temperature can well be understood by studying the temperature distribution in January and July. The temperature distribution is generally shown on the map with the help of isotherms. Isotherms geography The Isotherms are lines joining places having an equal temperature. In general, the effect of the latitude on … Read more
The temperature of the air at any place is influenced by: the latitude of the place; the altitude of the place; distance from the sea, the airmass circulation; the presence of warm and cold ocean currents; local aspects. The latitude The temperature of a place depends on the insolation received. It has been explained earlier … Read more
Heating and cooling of atmosphere The heating and cooling of the atmosphere happen in the atmosphere in different ways. The earth gets heated due to insolation. Then it transmits the heat using the long waveform to its nearest layer of the atmosphere. The Air which is in contact with land gets heated slowly. Also, the … Read more
Solar Insolation Solar Insulation is the amount of solar radiation incident upon a unit horizontal surface over a specified time for a given place. It mostly depends on the solar zenith angle and also on the ratio (d/dm) of the actual distance to the mean distance of the Earth from the Sun. The surface of … Read more
Structure of atmosphere The atmosphere consists of different layers with different temperatures and densities. The density of the atmosphere is highest at the surface of the earth and as the altitude increases the density of the atmosphere decreases. The column of the atmosphere has five different layers depending upon the condition of the temperature and … Read more
