Delhi Supergroup rocks are exposed in the Aravalli Mountains as a NE-SW trending ling linear belt from Delhi in the north-east through southeastern Haryana and Central Rajasthan to the north-eastern pat of Gujrat in the south-west. These rocks are strongly deformed and metamorphosed, only isolated hills and ridges made up of Delhi rocks. Delhi supergroup […]
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The Aravalli Mountains extending from Delhi in the north-east to the Gulf of Cambay in the south-west. The besetment of the Aravalli Mountains is comprised of Banded Gneissic Complex of Neoarchean age. It is overlain by three major cycles of deposition followed by orogenic deformation over the period from about 2.2Ga to 0.85 Ga. They
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A sequence of predominantly arenaceous and calcareous sediments was deposited in Bikaner-Nagaur Basin in the west of the Aravalli Range that has been formally named as Marwar Supergroup. This sequence was earlier regarded as equivalent of the Upper Vindhyan Group and was named as the Trans-Aravalli Vindhyans.
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The Cuddapah Basin is a crescent shaped, N-S trending Proterozoic basin in east-central part of the Dharwar craton. Chitravati (Cheyyair) Group :- The Chitravati Group consists of two formations: the Pulivendla Quartzite and the Tadpatri Formation. The transition from the Papaghni Group to the Chitravati Group is marked by the intermittent occurrence of mafic flows
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Lightening is a giant spark of electricity in the atmosphere between clouds, air or ground. When water vapor condenses into small ice crystals when it moves upwards in the cumulonimbus cloud. The ice crystals continues to grow till they gather enough mass to overcomes buoyance force this leads to a system where small ice crystals
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Thunderstorm is a rain with thunder and lightening. They are of short duration occurring over a small area. Thunder storms occurs in an area where temperature is high and a strong convective updraft is possible. they are less frequent on water bodies due to low temperature. Thunderstorms occurs in a cloud called Cumulonimbus and can
The Quasi-Biennial Oscillation is a regular variation of the winds that blow high above the equator. Strong winds in the stratosphere travel in a belt around the planet, and every 14 months or so, these winds completely change direction. This means a full cycle takes roughly 28 months, making it the most regular slow variation
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The Madden Julian Oscillation (MJO) is an equatorial travelling pattern of anomalous rainfall that is planetary in scale. The MJO can be defined as an eastward movement of clouds, rainfall, winds and pressure near the equator that typically recurs every 30 to 60 days. The MJO moves eastward at 5 meters per second across the
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The North Atlantic Oscillation (NAO) is one of the most prominent and recurrent patterns of atmospheric circulation variability. It dictates climate variability from the eastern seaboard of the United States to Siberia and from the Arctic to the subtropical Atlantic, especially during boreal winter, so variations in the NAO are important to society and for
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The name ‘ENSO’ is the close interaction between the atmosphere and ocean. It is an irregularly periodic variation in winds and sea-surface temperatures over the tropical eastern pacific ocean, affecting the climate of much of the tropics and subtropics. The warming phase of the sea temperature is known as El-Nino and the cooling phase is
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