“Toxic City” is a series that examines how environmental hazards in Philadelphia harm poor and minority children and others. The project is supported by grants from the Lenfest Institute for. 7. Dimension 3 DISCIPLINARY CORE IDEAS—EARTH AND SPACE SCIENCES. E arth and space sciences (ESS) investigate processes that operate on Earth and also address its place in the solar system and the galaxy. Thus ESS involve phenomena that range in scale from the unimaginably large to the invisibly small. This is 2018. This article was originally written in 1992 and totally debunked in, er, 1992. Please please do open research and read the debunking sites too, there is a lot of useful information in those. Radioactive contamination, also called radiological contamination, is the deposition of, or presence of radioactive substances on surfaces or within solids, liquids or gases (including the human body), where their presence is unintended or undesirable (from the International Atomic Energy Agency - IAEA - definition).. Such contamination presents a hazard because of the radioactive decay of the. Periods of abnormally high rainfall can result in groundwater flooding of basements and the emergence of groundwater at the ground surface, causing damage to property and infrastructure. FireX photoelectric combination alarm offers protection from two hazards - fire and carbon monoxide in one unit. Hardwire with battery backup alarm emits a beeping tone followed by a voice warning that clearly announces the danger: "Fire. Fire. Fire". or "Warning, carbon monoxide". News Dive into the world of science! Read these stories and narratives to learn about news items, hot topics, expeditions underway, and much more. An acronym is an abbreviation coined from the initial letter of each successive word in a term or phrase. In general, an acronym made up solely from the first letter of the major words in the expanded form is rendered in all capital letters (NATO from North Atlantic Treaty Organization; an exception would be ASEAN for Association of Southeast Asian Nations). The Council has the authority to adopt, amend, or repeal rules by following the rulemaking procedures of the Administrative Procedures Act under Oregon Revised Statutes 183.325 to 183.410.ORS 183 outlines the steps an agency must take to adopt rules. Back to Carbon Dioxide Lasers Sub-Table of Contents. Types and Excitation of CO2 Lasers Basic Principles of Operation (Portions from: David Crocker.) The physical arrangement of most CO2 lasers is similar to that of any other gas laser: a gas filled tube between a pair of mirrors excited by a DC or RF electrical discharge.