Tag: geography

Sonalika, Kalyan, Sona, Sabarmati, Lerma, Roso, Heera, are different varieties of Wheat.

Operation Flood was started by National Dairy Development Board (NDDB) in 1970s. The objective of this programme was to create a nationwide milk grid. The result was that India became the largest producer of Milk and Milk Products. Operation flood is called White Revolution of India.

A few showers of rain during the months of December and January are beneficial to the rabi crops because they protect the crops from frost.

Rice and Wheat 

Doldrums are regions of the Atlantic and Pacific oceans that have little if any wind. Doldrums are caused by solar radiation from the sun, as sunlight beams down directly on area around the equator. This heating causes the air to warm and rise straight up rather than blow horizontally. The result is little or no wind, sometimes for weeks on end. The Doldrums are located a little north of the equator, but the effects can be felt from 5 degrees north of the equator to 5 degrees south of it. This was a particular problem for sailors in the past when they depended on the winds to propel their ships. It was a problem that could be potentially deadly.

Altimeter is an instrument that measures the height of the land surface or any object such as an airplane. The most common types of altimeters are barometric. They determine altitude by measuring air pressure. As altitude increases, air pressure decreases. This is because the density of air is lower at high altitudes. Altimeters are important navigation instruments for aircraft and spacecraft pilots who monitor their height above the Earth’s surface. Skydivers and mountaineers also use altimeters to pinpoint their location in the sky or on the ground.

• Both atmospheric pressure and  the density of air decrease with altitude.
  
• This is due to the fact that air molecules are constantly being pulled downwards (towards the center of the Earth) by Gravity.
•  So, air molecules are tightly packed near the surface of the earth, compared to some higher altitude.
  

Isobars are imaginary lines joining the places having equal values of pressure. The horizontal distribution of pressure is shown by isobars. For convenience all the local level pressures are converted to sea level. Closely spaced isobars indicate strong pressure gradient and widely spaced isobars indicate weak pressure gradient.

Anemometer is a device which is used for measuring the speed of wind in the atmosphere. It also measures wind pressure. Anemometers are important tools for meteorologists, who study weather patterns. They are also important to the work of physicists, who study the way air moves. Anemometer has three or four cups attached to horizontal arms. The arms are attached to a vertical rod. As the wind blows, the cups rotate, making the rod spin. The stronger the wind blows, the faster the rod spins. The anemometer counts the number of rotations, or turns, which is used to calculate wind speed.