.... crust is formed of 13 continental plates. The boundaries of the zones are where tectonic activities occur, and where earthquakes and volcanic eruptions tend to happen. The plate tectonics theory was thought up in the 1960s and 1970s, with ideas taken from Wegener’s earlier thoughts. Earlier, Wegener and other scientists had noted that continental crust grows by additions and that a ridge in the middle of the ocean runs almost all the way around the world. It was also noted that continental plates tear apart, drift apart, and collide with each other. Seafloor Spreading Geophysicists, mapping the ocean floor with an instr .....

.... properties that make copper extremely useful include - Conductivity - Silver is the only better conductor, but is too expensive for common use. Copper also conducts both electricity and heat extremely well, which makes it extremely useful for cooking utensils, radiators, and refrigerators. Malleability - Copper is highly malleable. It does not crack when hammered, stamped, or forged, and can be worked when it is both hot and cold. It can be rolled into sheets less than 0.05mm thick. Cold rolling changes the physical properties of copper, and increases its strength. Ductility - Copper has the ability to be drawn into th .....

.... Key words: teaching sociology, information technology, on-line teaching Introduction Information technology is quickly becoming the hub of efforts within the higher education community. Indeed, colleges and universities have demonstrated a fierce rush to amass technological tools, and are only now addressing the possibilities for adapting them to academic use. Ideally, new networked information technologies, such as the World Wide Web and E-mail will become fruitful pedagogical tools for faculty of all disciplines. As academic libraries are "virtualized" and classrooms are equipped for Internet, teleconferencing, and d .....

.... the gas to escape and elevate the levels that are in the building.(6) Health Risk The Surgeon General's office reports that indoor radon gas is a national health problem. This gas causes thousands of deaths every year.(7) These deaths are a result of lung cancer, which is caused by the radioactive particles that make up the gas.(8) The likelihood of getting lung cancer from radon depends on: the concentration that you are exposed to, the amount of time that you are exposed, and whether you smoke or not. The radioactive particles are inhaled when we breathe, and become trapped in the lungs. Once in the lungs they release s .....

.... of time then deigns to lower itself into becoming a puppet-master and "pulling the strings" of the Earth and all of the people therein. Since this paper touches upon many scientific terms, I feel that in order for the reader to correctly grasp the content I must first define three words: Theory, Law, and Hypothesis. The definitions will allow for a greater understanding of this essay and give us an even ground upon which to begin. Theory; (thÿ1e-rÿ, thÿr1ÿ) noun 1. a. Systematically organized knowledge applicable in a relatively wide variety of circumstances, especially a system of assumptions, accepted pr .....

.... of Test tube + KClO4 41.5g 39.8g Mass of Test tube 37.5g 37.5 Mass of KClO4 4.0g 2.3g 2. Set up the apparatus shown below. 3. Gently heat the test tube containing the potassium perchlorate. Gas should begin to collect in the collection bottle. Record all observation. 4. Once the reaction is complete, no more gas give off, allow the test tube to cool. While the test tube is cooling test the gas in the collection bottle with glowing splint. Caution: Do not leave the rubber tubing down in the water trough during cooling or you will experience back-up. 5. After the test tube has cooled weigh it on a balance. What is the cha .....

.... they tend to stay pretty much as they are for the rest of their existence. Phyletic gradualism suggests that species continue to adapt to new challenges over the course of their history. Species selection and species sorting theories claim that there are macroevolutionary processes going on that make it more or less likely that certain species will exist for very long before becoming extinct, in a kind of parallel to what happens to genes in microevolution. The history of the concept of macroevolution In the "modern synthesis" of neo-Darwinism, which developed in the period from 1930 to 1950 with the reconciliation of e .....

.... of European honeybees. However, many of the basic African honeybee traits remain, including rapid population growth, frequent swarming, minimal hoarding of honey, the ability to survive on sparse supplies of pollen and nectar, and a highly defensive nature. Africanized honeybees are more difficult to manage than European honeybees and produce less honey. The businesses of many beekeepers in Latin American countries have failed as a result of Africanization of the native hives. Africanized honey bees are not expected to have the same impact in the United States because of advanced beekeeping technology and climatic limitations on th .....

.... of drugs, but soon he became genuinely interested in the subject and started to study it in great detail. His studies led him to Oxford where he joined such scientists as John Wilkins and John Wallis. Together in 1660, they founded the Royal Society of London for the Advancement of Science. From this point onwards, Boyle seriously undertook the reformation of science. For centuries scientists had been explaining the unknown with the simple explanation that God made it that way. Though Boyle did not argue with this, he did believe that there was a scientific explanation for God’s doings. Boyle’s poi .....

.... in Roswell, New Mexico, observed something that would be the beginning of what might be one of mankind's most unexplained phenomenons in history. According to these ranchers, (who asked to be anonymous) a flying object came out of the South East and went flying into the Northwesterly direction. These ranchers observed it for 40 or 50 seconds before it disappeared behind the hills. They did not recall it making any sounds (Roswell 1). The next day, another rancher recovered a part of what is believed to be, the flying object that was seen the night before. According to the Las Vegas Review Journal, the man gave it to aut .....