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Classification

... processes underlying the similarities and differences among organisms. Such categories form a kind of pyramid, or hierarchy, in which the different levels should represent the different degrees of evolutionary relationship. The hierarchy extends upward from several million species, each made up of individual organisms that are closely related, to a few kingdoms, each containing large assemblages of organisms, many of which are only distantly related. Carolus Linnaeus is probably the single most dominant figure in systematic classi ...

Number of words: 1136 | Number of pages: 5

Nuclear Power And Its Uses

... the radiation under controlled conditions. The radiation of the nuclear energy can help in medical tests. Radioactive phosphorus is an important diagnostic aid. It is injected into the veins of a patient, it concentrates in the cells of certain brain tumors. Thyroid gland strongly attracts iodine. Radioactive iodine is used both in diagnosing and in treating diseases of the thyroid. Nuclear power is changing the face of medicine with new cures and tests that will cure millions.. Nuclear power can be converted into strong and efficient nuclea ...

Number of words: 527 | Number of pages: 2

Black Friday: Tornado In Canada

... air from aloft when it comes falling down. The combination of severe thunderstorms and sweltering 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 tor ...

Number of words: 639 | Number of pages: 3

Avalanches And Landslides

... talk a little about past avalanches and landslides that have occurred like the 1903 Frank landslide and avalanche that happened at the same time, in Alberta Canada it destroyed the parks canyons it's beautiful trees' it's wonderful sights and killed nearly one hundred people, and covered a small town near Alberta with ice and snow. Another devastating avalanche incident is the 1964 Sherman slide, in which a huge avalanche was triggered by the 1964 Alaskan earthquake. The slide spilled out onto the Sherman glacier, during the big slide severa ...

Number of words: 583 | Number of pages: 3

Mercury

... is a solid when given a pressure of 7640 atmospheres (5.8 million torrs). It dissolves in nitric or concentrated sulfuric acid but is resistant to alkalies. Mercury melts at -39C, boils at about 357C,and has a gravity of 13.5. The atomic weight of mercury is 200.59. Mercury comes in its pure form or combined with silver in small amounts. It is mostly found in the form of the sulfide. Mercury has many uses and is a very important element. A major use of mercury is in electrical equipment such as fluorescent lamps, and mercury b ...

Number of words: 384 | Number of pages: 2

The Problems With Acid Rain

... slightly acidic. It is caused by today's industry. When products are manufactured many chemicals are used to create it. However because of the difficulty and cost of properly disposing of these products they are often emitted into the atmosphere with little or no treatment. The term was first considered to be important about 20 years ago when scientists in Sweden and Norway first 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 ...

Number of words: 1834 | Number of pages: 7

Evidence Of Technological Change

... econometric analyses of the effects of variables like the (appropriately lagged) rate of investment in computers and/ or other forms of “information capital” and the ratio of expenditures on research and development to sales on changes in the skill composition of industries (for examples, Berman, Bound and Griliches, 1994). The results of these studies are consistent with those of the case studies and the hypotheses that the recent technological change has shifted the relative demand for skilled labor to the right. Changes in productio ...

Number of words: 1850 | Number of pages: 7

Atmosphere Crisis

... could climb about 2 degrees Celsius in 20 years. This change in the global climate would have disastrous results, including drought, coastal flooding and increased species extinction. And, scientists have discovered a hole in the ozone layer. The ozone layer is the only protection for life on Earth against deadly ultraviolet radiation from the sun. Once the ozone layer is completely destroyed, all life on Earth will cease to exist, killed by the deadly radiation. The planet will become a barren rock devoid of all life. Global warming is ...

Number of words: 646 | Number of pages: 3

Aids 3

... important to fight against it. And finally, what can be done to treat and prevent it is essential. According to the World Health Organization we began to see what AIDS truly was in the late 1970’s to early 80’s, mostly in men and women with multiple sex partners located in East and Central Africa, but also in bisexuals and homosexuals in specific urban areas of the Americas, Ausrtalasia and Western Europe. Aids was and is spread still through infected hypodermic needles which drug abusers are affected by, but also through transfusion o ...

Number of words: 1460 | Number of pages: 6

The Noble Gases

... to detect helium in the sun’s spectrum. Helium is not found a lot on the earth because gravity cannot keep helium from escaping to space. Helium is found mostly in stars, where it goes through nuclear fusion with hydrogen. Most Helium comes from natural gas taps in North America. It is used in balloons and divers use it with oxygen to breath easier and to not get sick or dizzy. Neon is an element that is lighter than air. The element is found most common in the atmosphere of the earth. It is also found in the earth’s crust. Si ...

Number of words: 447 | Number of pages: 2

The Cambrian Period

... million years. It¹s very important because it corresponds with the firs t appearance of abundant fossils especially Trilobites, which characterizes a succeeding point in time. During the Cambrian Period the lapetus Ocean appeared, the predecessor of the Atlantic Ocean, which separated the young North American and Eurasian continents. Also Gondwanaland was in the final stages of development. Gondwanaland was a very large continent made up of what is now South America, Africa, Arabia, Madagascar, India, Australia, and Antarctica. Large sh ...

Number of words: 231 | Number of pages: 1

Purple Loosestrife

... loosestrife is an exotic species that was introduced to North America from Europe during the early 1800's. Europeans sailing to North America would fill their ships ballast with wet sand taken from shores of Europe, a habitat where purple loosestrife thrived. Upon arrival in North America the ballast would be dumped overboard on the shoreline. By 1830 the plant was well established along the New England seaboard. Purple loosestrife seeds were also found in sheep and livestock feed that was imported from Europe during this period. Th ...

Number of words: 3067 | Number of pages: 12

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