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!' h > b. I II!> I I r r ~. ~ , f I p. ~.. [ I ~ i i I ~..u . t i I i I from the director contmuedlrom p. 3 important roles in the nature and location of the water.. For example, about 20 percent of Colorado's citi- . zens get their watlldrom ground water systems, or aquifers. To . .understand the nature, extent, loca" tion and other Importilnt aquifer characteristics Ilk" depth, porosity, etc., one needs to understand the nature of the geologic formations serving as the aquifer, as well as the beds around those layers. Protection of water quality of ground-water aquifers is afuorelated to' geolagy, in that if you know where the recharge of the aquifers occUrs, you can pro- tect that location so that hazardous or cantaminating materials are not placed in or near the recharge areas. It's useful to understand the interac- tion between rocks ilIld water in terms of surface-water quality as well. There are many activities on CoIorod<>vOolog<<;al SurvoY ROCKTAIKVol. 5, No," I L the surface that can contaminate a stream-but there are also natural interactions that occur between the water ilIld the rocks it flows over, around and through, that cause met- als and acids to mave into streams. Knowing about these naturally occurring sources allows society to make better and cost-effective deci- sions about water treatment. This issue of RockTalk provides an overview of several projects being done by CGS geologists and hydro geologists that relate to the surface and groWtd water of Colorado. It's also a good reminder to us all that a simple drink of cool, clear. water is actually a geolagic phenomenon. EARTH SCIEN<E WEEk -AND WATER By the time you read this, CGS will have celebrated the fifth annual Earth Science Week, October 13-19,2002. Each year, Earth Science Week focuses on a different facet of earth science to help all people gain a better understanding and apprecia- tion of the natural world. This year, the theme will be "Water is All Around You" emphasizing the impartance of the earth's greatest natural resaurce. State geological surveys, the U.S. Geological Survey, and many.local and professional geological organizations celebrate Earth Science Week each year. You cilIl check aut the 2002 activitiesilIld learn more about Earth Science Week from the CGS website, or gO' to the Earth Science Week main web page at the American Geological Institute at: http://www. earthsci- week.org/. Even if this year's. Earth Science Week 2002 is over, we'll celebrate it again next year, during the week of October 12-18, 2003. fS