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Over the past 20,000 years the oceans have risen by more than 110 meters. by Dr. Nitish Priyadarshi The U.S. is shrinking –physically. It has lost nearly 20 meters of beach from its East coast during the 20th century. The oceans have risen by roughly 17 centimeters since 1900 through expansion (warmer water taking up more space) and the ongoing melt down of polar ice. That increase, however, is a small fraction compared with what’s to come. Sea level is of great concern to human beings especially to those living in coastal regions. India has the sixth longest coastline in the world and the fate of the occupants of the coastal areas critically depends, among other things, on the abrupt rise and fall of the sea level. Is the sea level rise is recent phenomenon or it has happened in earlier geological ages too? Different researches have shown that our planet earth has seen drastic sea level changes in past geological times. Before going in detail first we should understand the causes for ...

Varves has the similarity with the regular, annual rings of the trees. by Dr. Nitish Priyadarshi The study of climates during the geological past, is one of the most topical areas of research in the geosciences at present. The threat of future climate change caused by higher levels of green house gases, which would drastically alter many aspects of our environment, has prompted much research to try to understand how our own complex climate system works. Only by understanding how climate has evolved over million of years can we identify important climate cycles with a frequency in excess of the short climate records we possess. These climate cycles have the potential to have a profound effect on our environment. Understanding our climate history in the geological past is also important for climatologists trying to construct accurate numerical computer models of our present climate system to use for predicting future climate change. It is obviously not possible to check the accuracy of m...