.... today. A hard drive is what all the information you install in to your computer goes. Inside a hard drive it looks like large CD:ROM , but this one is magnetic. If you open one up it will look like egular record player. The needle is what writes the information onto the hard drive. The needle writes by the magnetic force that pushes it down on to the disk. Once it is on the hard drive , whenever you turn on your computer the information is always there for you when you need it. A CD:ROM looks like a music compact disk , but they are not that much alike. First a CD:ROM has a lot more information than a regular compact disk. A CD:ROM has audio as well as visual information ....

.... 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 the predicted result of the greenhouse effect, created by so-called greenhouse gases, such as carbon dioxide and methane, in the atmosphere. The increase in these gases is thought to be caused by industrialization, especially by the use of fossil fuels such as coal and oil. These gas ....

.... usually has the most immediate and far-reaching effects because of the huge changes it causes to river circulation system. Some 40,000 large dams, most of which were built in the past 50 years, now obstruct the world's rivers. More than 400,000 square kilometers--an area larger than Zimbabwe, and 13 times the size of Lesotho. Volta Reservoir behind Ghana's Akasombo Dam, flooded 4% of that nation's land area. In the United States, whose 5,500 large dams make it the second most dammed country in the world, we have stopped building large dams, and are now spending great amounts of money trying to fix the problems created by existing dams. Although the impacts of l ....

.... anatomical planes appear, followed by enzymatic degradation of the tissues. Ligaments become lax, losing their tensile strength. The cartilage that caps the ends of bones, and which is normally four times more slippery than Teflon, loses that slipperiness and becomes perforated by ulcers. Many of the changes that occur in the joints of people with rheumatoid arthritis and osteo-arthritis are assumed to be caused by a disease process, when in fact they are often a consequence of relative immobility. These findings underscore the enormous importance of exercise in the fight against arthritis. You should realize that immobility will set off the destructive set of events. Af ....

.... air, we will attempt to determine if air exerts a force? HYPOTHESIS: My hypothesis for: 1) the experiment with the pop can is that the can will crush because of a drastic change in temperature. 2) the experiment with the milk jug and the hot water is that the milk jug will remain the same. 3) the experiment with the egg and the bottle is that the egg will not be sucked in the bottle. PROCEDURE: For the first experiment the procedure is: 1) Heat an ordinary pop can on a hot plate. 2) After about fifteen minutes take the can off the hot plate and put it upside-down in a pan of cold water. 3) Record my observations on a piece of paper. 4) Write my conclusi ....

.... senses. The study of ESP is a part of a science called parapsychology. This is also called psychical research, or psi for short. Besides ESP, there is another branch of psi communication which includes the phenomenon in which an object seems to be moved by the mind alone. The mover does not touch the object which can be living or non living. This is called psychokinesis or PK. There are three accepted types of ESP, clairvoyance, precognition,and telepathy. Clairvoyance is the extra sensory perception of events that are taking place at the exact time of the perception, but the sensor cannot know of these events through any of the five senses. Precognition is the ext ....

.... a boiling point of -80 degrees C and a freezing point of -100 degrees C. In reality, however, water has a boiling point of 100 degrees C and a freezing point of 0 degrees C. The amount of energy needed to raise the temperature of one gram of water by one Celsius degree is called a Calorie. One Calorie is about twice as much energy as you need to warm one gram of most other fluids by the same amount. This makes water much better for regulating the temperatures of animals and the environment. Water also has a very high heat of vaporization. Converting one gram of cold water into ice requires 80 Calories of energy. Converting the same amount of very hot water into ste ....

.... ductile only when free of oxygen. This metal, which does burn in the air, is the only element that burns in nitrogen. is resistant to dilute sulfuric and hydrochloric acid, most of the organic acids, most chlorine gas, and chloride solutions. When natural, is reported to become very radioactive after being bombarded with neutrons. The emitted radiations are mostly positrons and gamma rays. The hexagonal alpha form changes to the cubic beta form very slowly at around 880 degrees Celsius. The metal combines with oxygen at red heat, and with chorine at 550 degrees Celsius. when a metal, is considered to be physiologically inert. Pure dioxide is kind of clear and has an extre ....