Shallow ground-water systems are commonly used for drinking water sources and they make up a large part of the baseflow in rivers and lakes.

However, shallow ground-water supplies are generally young (recently recharged) and, because there has been a wide variety of man-made pollutants produced in the 20th century, are more susceptible to contamination than deeper ground water.

Although different from these, Nevada's rock art is equally significant and deserves to be documented, protected and brought to the attention of a wider audience so we may better understand the role art in prehistoric lifeways.

Visit the Art of Ancient Nevada webpages for more information on rock art, Great Basin prehistory, and ethnography.

Nevada's increasing population threatens the existence of many of these archaeological sites.

Natural elements and the public's lack of understanding are eroding the physical record of past cultural practices and the knowledge they contain.

They've probably been hanging out with friends of both sexes and doing things as a group, but they may be thinking about one-on-one dating.It's time to talk about the different types of relationships and love and to prepare to set rules for dating.Talking about relationships in regular, everyday conversations lets you and your child talk about your family values when it comes to friendship, dating, and love.In the atmosphere, these substances have mixed and spread worldwide.These atmospheric substances, such as tritium (H) in water vapor from detonation of nuclear bombs in the 1950s and early 1960s,and chlorofluorocarbons (CFCs) from refrigeration and other uses from the 1950s through the 1980s, dissolve in precipitation, become incorporated in the Earth’s hydrologic cycle, and can be found in ground water that has been recharged within the past 50 years.

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