... sunlight they form ground level ozone. Ground level ozone is a major ingredient in the formation of smog. Ground level ozone is responsible for irritating eyes, damaging lungs, and it complicating respiratory problems. Hydrocarbons aren't the only pollutants released through car exhaust. Two more pollutants released through car exhaust are carbon monoxide and nitrogen oxide. The first reduces the flow of oxygen to the bloodstream, and could harm people with heart disease. Nitrogen oxide is formed when a car engine gets hot. It contains chemicals that aid in the formation of ground level ozone as well as acid rain (2 factsheet, OMS-5). Acid rain destroys the ...

... becomes progressively dense. This atmosphere can be divide into four major regions. The first region is the troposphere which extends about 6.5 miles above the planet's surface. The troposphere contains the oxygen that we breath and is where a majority of our weather takes place. Beyond the troposphere is the second region of the atmosphere, the stratosphere. The stratosphere extends from roughly 6.5-30 miles from the earth's' surface. The air on this region is much less dense than in the troposphere, and it's a lot drier. The stratosphere is the area that contains the majority of the ozone layer. Past the stratosphere is the mesosphere which extends ...

... Jackass Penguin. They are called this because of the loud braying noise, which the little penguins make. This species is the only species that breeds anywhere in Africa. It breeds on some twenty islands, from Hollams Bird Island off the coast of Namibia to Bird Island in Algoa Bay. At one time the population of the African Penguin was quite large but some man caused factors has drastically reduced their species. A long time ago the early European settlers at the Cape of Good Hope realized that penguin eggs were good for eating and over the years millions of penguin eggs have been collected greatly reducing the population of the African penguin species, ...

... many ecosystems, affecting wildlife populations in various ways, such as by changing habitat, affecting food supply or quality, or by altering interactions of species. Fire suppression has allowed forested areas to achieve a climax state which provides less forage for wildlife. While terrestrial wildlife is benefited by fire, aquatic ecosystems are negatively impacted by large fires through the increase in sediment flow. Fire is essential in maintaining biological diversity in the Northern Rocky Mountain forests. NEGATIVE EFFECTS - AQUATIC ECOSYSTEMS Contrary to the beneficial impacts of fire on terrestrial wildlife, aquatic ecosystems are negatively affected, s ...

... numerous intense physical and psychological evaluations. Finally, out of a field of 500 people who met the experience, training, and height requirements, NASA selected seven to become U.S. astronauts. There names, Lieutenant M. Scott Carpenter; Air Force Captains L. Gordon Cooper, Jr., Virgil “ Gus” Grissom, and Donald K. “Deke” Slayton; Marine Lieutenant Colonel John H. Glenn, Jr.; and Navy Lieutenant commanders Walter M. Schirra, Jr., and Alan B. Shepard, Jr. Of these, all flew in Project Mercury except Deke Slayton who was grounded for medical reasons. He later became an American crewmember of the Apollo-Soyuz Test Project. The Mercury module was a bell shap ...

... then attaches with other oxygen molecules to form O3. O3 is ozone. So when ozone is formed, harmful rays from the sun are absorbed. The O3 molecule is very reactive and it bonds easily with other molecules it the atmosphere. When and oxygen atom from the ozone reacts with a chloride ion from chlorine monoxide, the ozone molecule is destroyed. So chlorine monoxide is an ozone destroyer. There is always a certain amount of chlorine monoxide in the atmosphere. It is important to remember that ozone is constantly being created and destroyed in the atmosphere. The amount of ozone in the atmosphere is based on these reactions. There are many factors that influence the a ...

... found when produced artificially in a laboratory. Discovery of the element was first claimed in 1957 by scientific groups in the United States, Great Britain, and Sweden, but the first confirmed discovery of a nobelium isotope was by a team of scientists at the Lawrence Radiation Laboratory in Berkeley, California and that took place in 1958. The isotope was created by bombarding curium isotopes with carbon ions. Chemically, the properties of nobelium are unknown, but because it is an actinide, its properties should resemble those of the rare earth elements. Isotopes with mass numbers from 250 to 259 and 262 are known. The most stable isotope, nobelium-259, has a h ...

... breakdown, the skin will sag, and the muscle will lose its firmness. Another sign of passive aging is the breakdown of lipids at the biochemical level. As aging membranes leak during this lipid degeneration, a fatty, brown pigment known as lipofuscin accumulates. As this happens, the mitochondria, or the “powerhouse of the cell” begins to break down, thereby decreasing the amount of energy that is being supplied to the cell. This cellular degeneration may be set into action by highly reactive chemicals known as free radicals. These molecules have an unpaired electron in the outermost valence shell. This causes the molecule to grab electrons from other mo ...

... There are certain disorders that children can develop- when their GnRH is not released into the brain. For instance, gonadotropin-independent precocity, this is when the Childs ovaries or testes still make steroids even without the release of GnRH. Since these children are still producing steroids without GnRH being released, low doses of Provera are not effective. For the body to produce steroid hormones it must convert cholesterol into estrogens and other related substances. In order for this process to take place, several steps are involved which are controlled by a certain enzyme. In knowing this, Lee wanted to find out if blocking the action of ...

... a CD's 650MB. But DVD is more than just higher capacity, which is partly why things get so complicated. DVD is a critical element of PC/TV convergence, since it's a way to distribute movies with extended features such as user-selectable camera angles and multiple language support. Also, like CD's, there are writeable and rewriteable variations coming. DVD is just starting to make a significant impact on the market. Estimates vary from about 600,000 to 1,000,000 console players ("living room" boxes used strictly to play movies) sold in the United States through the end of 1998. So far, the number of DVD drives in PCs is far smaller. DVD technology can handl ...