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Changes In The Earth's Environment

... hazard prone areas. Events which may have gone unnoticed previously, only become hazards when there is intervention with humans and their lifestyle. With the discovery of the ozone hole in the 1980's attention was now more focused on the threat humans were posing to the environment. With scientific evidence to back up pessimistic predictions of our future, most people, through media coverage, political pressures and general concern now see the environment as being truly threatened by human progress and in desperate need of help. Natural ...

Number of words: 2141 | Number of pages: 8

Acid Rain, Effects And Causes

... and buildings, as well as posing a threat to human health. The actual term "acid rain" was first used over one hundred years ago by British chemist Robert Angus Smith. At that time, he realized that smoke and fumes from human activities could change the acidity of precipitation. Unfortunately his awareness was not considered an environmental concern until the 1950's. Around this time, increased levels of acidity were discovered in lakes in both Canada and Scandinavia. At first, this was looked at as an interesting situation, rather than a g ...

Number of words: 1954 | Number of pages: 8

Hurricanes 3

... life and damage to existing constructed resources and infrastructures. Hurricane Gilbert, September 1998 was described by meteorologists at the US National Center in Miami, as the most intense western-hemisphere tropical cyclone on record. Large areas of Jamaica were devastated and the country’s Prime Minister, Edward Seaga, pronounce it the worst natural disaster ever to strike his country. Greatest loss of life however, occurred in Mexico where Gilbert hit twice, first of all traversing the Yucatan Peninsula and two days later making ...

Number of words: 1570 | Number of pages: 6

Leprosy

... each year. Scientists are now able to grow the bacteria in test tubes. The normal form of seen in most cases is called dimorphous. This form is what a person first gets, but when the body can't fight it turns into lepromatous. This formattacks nerves, the skin, the mucous membranes, and the eyes.In most cases it is easy to detect the disease. At first many people will loose a sense of feeling in a patch of skin. Then after the loss of feeling in certain area the muscles may become paralyzed due to the damage of the nervous system. Many ti ...

Number of words: 351 | Number of pages: 2

AIDS: Is It A Modern Plague?

... tyrants are microorganisms. Underdeveloped countries, technologically advanced countries, and those in between are at the mercy of these microorganisms, which come in many forms - viruses, bacteria, fungi and parasites. The most dangerous of these forms is the virus. Some viruses, such as the common flu, are considered to have a fairly detrimental capacity. The flu can incapacitate a human for several weeks with various symptoms such as bodily soreness, fever, bronchial complications, and even pneumonia. But while these conditions can ...

Number of words: 924 | Number of pages: 4

The Importance Of Insects

... are dependent almost solely upon bees, butterflies, moths, flies, beetles and wasps for pollination. Without any insects, these plants would all die, as would the most of the living Earth. Insects, primarily bees, gather pollen as food for themselves, but in doing so, great amounts of pollen collects on their hairy legs and body and it is transferred to a female structure and more plants are on the way. Many plants rely on insects so greatly that they have evolved around them. None of the vibrant colors in the garden were created for your pl ...

Number of words: 508 | Number of pages: 2

Solving The Mystery Of The Romanovs

... process of oxidative phosphorylation. Yet there is a noncoding region about 1,100 nucleotides long. This region contains signals that control the replication of the chromosome and the transcription of the mitochondria genes. This DNA sequence accumulates mutations ten times the rate of the nuclear DNA. This high mutation rate results in unique patters of single nucleotide polymorphisms, which are inhereited through generations. Because of the location of the polymorphisms in the cells cytoplasm, during fertilization, mitochondria are only ...

Number of words: 476 | Number of pages: 2

Chimpanzee

... troglodytes schweinfurthii) are known to kill and eat mammals in various parts of Africa. Monkeys were recorded to be consumed in the Gombe National Park, the Kasakati Basin, and the Budongo Forest. Moreover, there is new evidence that chimpanzees near the Ugalla River of western Tanzania also consume mammals.(Riss, 1990:167) Cannibalism has also been recorded both in the Budongo Forest, Mahale Mountains and the Gombe National Park. In Jane Goodall's, May 1979 article in the National Geographic called "Life and Death at Gom ...

Number of words: 2281 | Number of pages: 9

Radio Waves

... among the many types of electromagnetic waves that travel within the electromagnetic spectrum. Radio waves can be defined by their frequency (in hertz, after Heinich Hertz , who first produced radio waves electronically), which is number of times they pass through a complete cycle per second; or by their wavelength, which is determined by the distance (by meters) that is traveled from the crest of one wave to the crest of the next. Radio frequencies are measured in units called kilohertz, megahertz, and gigahertz. (1 kilohertz = 1000 he ...

Number of words: 803 | Number of pages: 3

Predators And Ecosystem Management

... and the coastal ecosystems by giving us a living example, the sea otter and the kelp forests. The relation between the sea otters and the kelp-forests was provided because of a accident of history, the over-exploitation of sea otters in the Pacific maritime fur trade. The study compared areas where sea otters were abundant with nearby areas to area's where they're almost extinct. By doing this comparison of the sea otters coastal system it was possible to gain much insight into the sea otter ecological role in kelp-forest ecosystem. Over th ...

Number of words: 419 | Number of pages: 2

How Technology Effects Modern America

... by a sixth for high school graduates and by about 7% for those with some college education. Only the wages of college graduates are up. Of the fastest growing technical jobs, software engineering tops the list. Carnegie Mellon University reports, "recruitment of its software engineering students is up this year by over 20%." All engineering jobs are paying well; proving that highly skilled labor is what employers want! "There is clear evidence that the supply of workers in the [unskilled labor] categories already exceeds the demand for t ...

Number of words: 1151 | Number of pages: 5

Freezing Point

... heat of fusion. Similarly, if heat is abstracted from a mixture of liquid and solid substance at its freezing point, the substance will remain at the same temperature until it has become completely solid, because heat is given off by the substance in its change from the liquid to the solid state. Hence, the freezing point or melting point of a pure substance may also be defined as the temperature at which freezing or melting continues once it has commenced. All solids melt when heated to their melting points, but most liquids can remain l ...

Number of words: 510 | Number of pages: 2

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