Acid precipitation affects stone primarily in two ways: dissolution and alteration. When sulfurous, sulfuric, and nitric acids in polluted air react with the calcite in marble and limestone, the calcite dissolves. In exposed areas of buildings and...
Scientists from many disciplines are studying acid precipitation and its impact. The National Acid Precipitation Assessment Program, a Federal program involving representatives from more than a dozen Federal agencies, has sponsored studies on how acid...
First of all, plants naturally grow in and around lakes. Maybe you're asking about a lake that is being choked off by too much algae. In many cases, humans are responsible. Actually, these lakes are being fed too much food for plants! There are certain...
Eutrophication is the process by which a body of water acquires a high concentration of nutrients, especially phosphorus and nitrogen. These typically promote excessive growth of algae. As the algae die and decompose, oxidation of this organic matter and...
Mercury contamination is widespread. Mercury was detected in all fish sampled from 291 streams across the U.S. Concentrations in about a quarter of the fish sampled exceeded the criterion for the protection of humans who consume average amounts of fish,...
First let's talk about what E. coli is. It is a type of bacteria commonly found in the intestines of animals and humans. The presence of E. coli in water is a strong indication of recent sewage or animal waste contamination. The full fact sheet is on the...
UraniumUranium is a trace element that occurs naturally in the earth's crust. Uranium is the first element in a long series of decay that produces radium and radon. Uranium is referred to as the parent element, and radium and radon are called daughters....