... believed that acidic rain may be causing great ecological damage to the planet. The problem was that by the time that the scientist found the problem it was already very large. Detecting an acid lake is often quite difficult. A lake does not become acid over night. It happens over a period of many years, or even decades. The changes are usually to gradual for them to be noticed early. At the beginning of the 20th century most rivers and lakes like the river Tovdal in Norway had not yet begun to die. However by 1976 local inspectors were noticing that many of the lakes were beginning to show signs of death. Fish ...

... its destination. There are two different bridge standards: Source-Routing (SR), which is common in Token Ring environment, and Transparent Spanning Tree (TST), which common in Ethernet environment. The IEEE standard for MAC bridges is ANSI/IEEE 802.1D: MAC Sub-layer Interconnection. Bridge Routing Requirements In general, LANs are low-cost, low-delay, high-bandwidth (e.g., 1-10 Mbps) broadcast channels. A bridged LAN environment preserves the low-delay and high-bandwidth feature but its topology may be more dynamic than in a single LAN due to possible bridge or LAN failures and hosts being moved around. Bridge rout ...

... cell division. This means that the number of muscle fibers is set before birth and most of these fibers will last a lifetime. The muscle growth that occurs after birth is a result of the enlargement of these existing muscle fibers. The mature muscle fibers have a few myoblasts, which remain as satellite cells. These myoblasts retain the capacity to join with one another or with damaged muscle fibers in order to regenerate these muscle fibers. John Centore2 Dr. Jain Anatomy & Physiology The many nuclei of skeletal muscle fiber are located underneath the sarcolemma, which is the fiber’s plasma membrane. Th ...

... in children, birth defects and cancer. Studies at Vanderbuilt University show that the effects of on sleep varies greatly between individuals. Some people feel no effects while others reported reduced or poorer quality sleep. The article also states that has very little effect on blood pressure. Only people that are highly sensitive to , experience a short period of higher blood pressure then they normally have. In an experiment done by the Harvard Medical School in 1990 say that has no direct link to infertility either. Nor does it have an effect on a pregnant woman and/or her unborn child. In addition all ...

... is when chemicals like leachates and other harmful materials that result from decomposing trash begin to leak out of the . When are located near bodies of water and are not properly maintained, chemicals and other materials can leak out and will go into the water which will be extremely hard to clean but will be hard for the EPA to detect. Doing this will allow the companies to save money because they will not have to barrel the leachates and pay to have them properly disposed of or stored ( 1). There are many things deposited in . Garbage, rubbish, ashes, large wastes, dead animals, sewage-treatment solids ...

... the metal to be at a lower potential difference, theoretically slowing rust formation. There are a number of major problems with Capacitive Coupling for vehicles. Firstly, if there are stone chips or cracks in the paint, the dielectric is broken and so the charge is lost. So you need to make sure that there is no bare metal, chips or cracks on the vehicle, which is impractical. Another problem is that it is almost impossible to hold a charge (potential difference) on a sharp thin edge of metal, and so this technology is not really suited for vehicles, which are made up of many irregular shapes. Because of this, it ...

... heat are the breeding grounds for a tornados' formation. The first sign of a tornado is a strong dust whirlwind along with a funnel growing from the storm cloud. A more organized funnel descends farther from the cloud, sometimes even touching the ground. Funnel winds generally move counterclockwise and the funnel can move slowly or at about 100/ft per second. Eventually the tornado becomes fragmented and dissipates causing the end of the tornado. Tornados are the cause of great destruction and devistation in the area in which they occur. For example the Tri-State Tornado of 1925 occured in the Kansas, Oklahoma, ...

... in the earths crust. Minerals are formed in a positive response to their environment, most of them to deep for an observer. Environments in which minerals are formed far beneath the earths surface are plutonic igneous, pegmatitic, hot temperature vein, moderate temp. vein, low temp. vein, and a metamorphic environment. Environments in which minerals form near the earths surface are groundwater, weathering, and sedimentary. Minerals are divided into groups on the basis of their composition. About one third of all mineral belong to the group silicates. Other groups are carbonates they includes calcite, oxide whi ...

... French Anderson, Michael Blaise, and Ken Culver performed the first successful gene therapy on a human in 1990. They developed a protocol for treating Adenosine deaminase (ADA) deficiency, a severe combined immune deficiency, also known as the "Boy in the Bubble disease." ADA deficiency is a result of inheriting two copies of the defective ADA gene. Possession of a normal gene leads to the continuous, regular production of ADA in cells throughout the body. Without at least one properly functioning gene, children have no way of converting deoxyadenosine (a waste product) into inosine. This leads to the rapid build ...

... to cause ecological imbalances. DDT was used as an insecticide up until 1972. It almost wiped out the Bald Eagle population. It caused the birds to lay eggs so thin shelled eggs the eggs were unhatchable. Laws banned the use of DDT and also required the reduction of lead in gas. DDT is still used in developing countries on the malaria-carrying mosquito. Oil spills also have harmful effects, luckily chemicals can neutralize the oil before massive damage occurs. In 1983 the Dow Chemical Company’s factory, a major producer of chemicals, showed contamination from dioxin. Dow undertook a 3 million dollar study ...