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They include amino acid racemization, useful in measuring shells and other bicarbonates between 500 and 300,000 years old, and obsidian hydration, used to measure natural glass between 500 to 200,000 years old.These methods are not so useful in measuring the age of fossils and bones but they are useful in measuring the age of objects such as beads and shellfish eaten as food found with fossils and bones.As one of the most active factors, groundwater age is a key to understand the hydrological cycle as well as the associated hydro-ecological processes in a watershed.

Once a hominid fossil has been discovered it can be dated by two main ways: 1) by analyzing the volcanic ash around the fossils; 2) by analyzing the other fossils found around the newly discovered hominid bones. If the ash is older than 1.6 million it can be dated with the potassium-argon method, which dates items by measuring chemical decay.

Each volcanic eruption has a unique "fingerprint" and sometimes they scatter ash over a vast area.

Therefore, it provides a cost-effective tool to understand the groundwater flow system.

Laboratory and field studies have consistently shown that CFCs are stable in the aerobic environments and their concentrations of groundwater can reflect atmospheric values at the time of recharge (Oster et al. Wetlands play an important role in climatic regulation, water conservation and purification, and the maintenance of biological diversity.

Admit it--you wish your workshops and conferences were livelier.

Often the most animated interactions and the most valuable learning take place during breaks, meals, and receptions.Abstract Most Extension educators seek new ideas for organizing more exciting and animated workshops and conferences.This article describes structured networking activities (also know as "speed dating") that succeed in enlivening meetings, strengthening networking, and improving learning.Furthermore, the mixture of groundwater with different age was discussed by CFC-12 and CFC-113 based on the binary mixing model and piston-flow model.As a result, the apparent age of groundwater in the study area is in the range of 38–48 years.To delineate the groundwater flow system in a basin, the groundwater age was estimated by analyzing chlorofluorocarbons (CFC-11, CFC-12 and CFC-113) in a typical headwater wetland in Ichikawa, Japan.