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Acid Rain

... and homes was falling back to Earth as colored rain. In severely polluted areas, rain can be as acidic as the acids lemon juice and vinegar. Rain which is very acidic can cause damage to trees, lakes, wildlife, buildings, and human health. Some air pollution comes from natural sources, but most is human made. The burning of coal and oil (fossil fuels) by factories, homes, and cars is the main source of chemicals that cause . Power stations emit large amounts of sulfur dioxide and also nitrogen oxides, while car exhaust contains large am ...

Number of words: 1213 | Number of pages: 5

Mitosis

... the DNA replicates, and all of the preparations are made to be ready for to take place. The chromatis is coiled up and consists of loose threads. In prophase, the next longest stage, the chromatin becomes chromatids which later form chromosomes. They are attached to the centrioles by spindle fibers. The chromosomes are lined up in the center of the celll. The nucleolus and nuclear membrane disappear. In the next phase, metaphase, the chromosomes line up along the metaphase plate. The plate is the midpoint of the cell between the two c ...

Number of words: 239 | Number of pages: 1

Aluminium

... found as corundum, a crystalline. Aluminium can also occur as cryolite (Na3AlF6). Traces of other metal oxides in Aluminium oxide tint it to make it form stones (often precious) for example: chronium gives a red colour to rubies, and cobalt makes the blue in sapphires. How Aluminium deposits are formed Aluminium (like many other metals) is not found in it's pure form, but associated with other elements in rocks and minerals. An aluminosilicate such as felspar (KAlSi3O8) is the main constituent of many rocks such as granite, which is quartz a ...

Number of words: 493 | Number of pages: 2

Hereditary

... as an affinity for music. Another factor in who you are is the environment you live in. The environment you are in may affect how you develop. For instance, if you have a talent for music, but have no way to acquire instruments, then it is doubtful that you will ever discover your talent with music. Physically, you may have great potential as a runner, but, if you do not get enough to eat, then it is doubtful that you will ever live up to your potential. Traits such as what you look like are inherited from your parents. Your pote ...

Number of words: 979 | Number of pages: 4

Chromosome Probes At The University Of Toronto

... probes or markers for six plus the gender determining X and Y chromosomes. "What we're trying to decide now is whether to isolate probes for the other chromosomes, or whether we should utilize the eight we have," he says. Dr. Willard is currently negotiating with an American company to develop prenatal diagnostic tests, which, because the current tests are time consuming and technically difficult to do, are restricted to women over 35 and those who have a family history of chromosomal abnormalities. Prenatal tests using Willard ...

Number of words: 726 | Number of pages: 3

Global Warming

... sounded by W. Broecker (1975). The relationships among humans, their activities and global temperature can be assessed by making the appropriate measurements and analyzing the data in a way that shows the connections and their magnitudes. Human population can be closely estimated and the consequences of their activities can be measured. For example, the volume of carbon dioxide, methane and nitrous oxide emissions is an indicator of human's energy and resource consumption. An examination of population size, atmospheric concentrations of the ...

Number of words: 2521 | Number of pages: 10

Darwinism

... traits are more likely to survive and reproduce. Darwin called this process natural selection. Darwin did not understand how or why variation existed. Today scientists realize that variation arises through random changes (called mutations) to existing genes. Genes are the chemicals that determine the traits and characteristics of animals and plants. Every trait has one or more gene associated with it. Thus, natural selection provides the animals and plants with the best genes. Supporters of neo-Darwinism believe that natu ...

Number of words: 1182 | Number of pages: 5

Development Of Operating Systems

... and powerful operating systems, with each new generation able to handle and perform more complex tasks. The folowing report examines the , and how the changing tehcnology shaped the evolution of operating systems. First Generation Computers (1945-1955) In the mid-1940's enormous machines capable of performing numerical calculations were created. The machine consisted of vacuum tubes and plugboards, and programming was done purely in machine code. Programming languages were unheard of during the early part of the period, and each mach ...

Number of words: 1757 | Number of pages: 7

Intranet 2

... This reduces the cost when trying to implement this type of network because the machines and operating systems already at hand can still be used throughout the network without conflicting with one another. Quick access and easy programming is also another consideration that is made when considering this type of network. Intranets have just started to be implemented throughout the world and already a big change is being noticed. Companies are keeping track of all of their important information on web sites, which are restricted to user ...

Number of words: 1573 | Number of pages: 6

Acting To Save Mother Earth

... about 120 pounds of newsprint a year-enough to use up one tree. That means close to 250 million trees each year are destroyed for paper in this country alone. If we recycled only one-tenth of our newpaper, we would save 25 million trees a year. Second, making new paper from old paper uses up much less energy than making paper from trees. Finally, this process also reduces the air pollution of paper-making by 95 percent. Another earth saving habit is "precycling" waste. This means buying food and other products packaged only in materials t ...

Number of words: 500 | Number of pages: 2

How Natural Processes Operate At A Coastal Eographic Environ

... them to another location. There are many types of processes that cause erosion at Muriwai such as wave erosion, wind erosion and wave refraction. Thousands of years ago when sea levels dropped over years at the Southern end of Muriwai, the sedimentary rock and sandstone was exposed to the air. Rock from volcanic activity mixed with the sedimentary rock; this is called Breccia – a mixture of all rock. An example of this is at Maori Bay. Coastal Erosion operates at different rates and different times. Limestone rock is eroded ...

Number of words: 1040 | Number of pages: 4

Meth

... is a very powerful stimulant. Very quickly the desire for the drug surpasses other interests- including the need for food, sleep, friends, sex, and family. The effects of this drug are long-lasting. Food and water become unimportant after taking it. Seizures and death can occur. Meth can cause: angry, hostile, and anxious feelings, violent behaviors, confusion, mental illness, increased physical activity, loss of appetite, increased heart rate, inability to sleep, strokes can occur, chest pain, increased blood pressure, irregular hea ...

Number of words: 357 | Number of pages: 2

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