The present investigation deals with the analysis of physico-chemical characteristics, concentration of heavy metals and textural analysis of sediments in Poovar estuary of Kerala during the period 2004-2005. Three sampling stations were selected and sediments were collected for the study.

Water quality of lake normall get contaminated every where by accumulaton of sediments, human waste, silt, organic matter, industrial waste but in India different type of religious activities (idol immersion) are taking place every year, to which other countries are not concerned. The water bodies selected for the study are Upper and Lower Lakes of Bhopal, Madhya Pradesh.

The coastal and marine nitrogen cycle occupies a complex, central role within the biogeochemical cycles. Human interventions in the earth system have risen to unprecedented levels, strongly influencing the global nitrogen cycle. The nitrogen cycle in the open ocean compared to coastal ecosystems appears to have remained unharmed, although recent observations have shown increasing anthropogenic influence.

The South Asian rivers show a discharge weighted average NO3-N of 2 mg/l and average sediment-bound N, that is mostly organic, of 0.2%. The reported global average for the uncontaminated river system is of the order of about 0.028 mg/l (NO3-N). Hence, our freshwater aquatic systems can no longer be considered natural, at least with respect to nitrogen transport.

Martin Kennedy and colleagues searched the Australian outback for clues to the transition out of Snowball Earth. The answer, as it turns out, was much closer to home.

Silicate weathering reactions remove carbon dioxide from the atmosphere and store it in carbonate minerals. During the high atmospheric carbon dioxide conditions of the Early Eocene Climatic Optimum, rates of chemical weathering, physical erosion and denudation in the western USA were equivalent to the highest recorded rates in the non-glacial Quaternary.

Authigenic carbonates within the Reynella Member of the glacial Elatina Formation occur in coastal cliff exposures of the Marinoan type section in South Australia and provide constraints on the magnitude and timing of methane influence during deglaciation.

Heed to the warnings of ill-planned approach Challenges thrown up by the Ranganadi Hydro Electric Project (rhep) stage I, commissioned in 2002, are lessons to be

A continuous lake record elucidates how Saharan climate changed gradually from humid to today's desert conditions.

Desiccation of the Sahara since the middle Holocene has eradicated all but a few natural archives recording its transition from a "green Sahara" to the present hyperarid desert.