.... fragments, and 3. gas. Lava Lava is the name for magma that has been released onto the Earth's surface. When lava comes to the Earth's surface, it is red hot and may have temperatures of more than 2012 degrees Fahrenheit. Fluid lava flows swiftly down a volcano's slopes. Sticky lava flows more slowly. As the lava cools, it may harden into many different formations. Highly fluid lava hardens into smooth, folded sheets of rock called pahoehoe. Stickier lava cools into rough, jagged sheets of rock called aa. Pahoehoe and aa cover large areas of Hawaii, where the terms originated. The stickiest lava forms flows of boulders and rubble called block flows. It ma .....

.... had virus attacks. That was a rise from 54% in 1994. The cost of each attack was estimated at $13, 000. The NSCA (National Computer Security Association) reported in January of 1997 that 200 macro viruses had been discovered. Six months later the amount of macro viruses had risen by over 300%. At this stage it is estimated that 90% of all companies have at least one macro virus resident somewhere in their computer systems. Types of Viruses Under the main heading of viruses are three types of harmful computer programs, not all of which hide and replicate. The first of these is the Trojan Horse programs, the name of which comes from the Gree .....

.... generally obtain heat from their external surroundings. Their body temperature varies, corresponding at any time with the temperature of their external environment. Endothermic animals, on the other hand, have relatively constant body temperatures. Their body temperature is independent of that of their external environment. Monkeys and walruses, for example, both have body temperatures of about 38„aC, despite living in very different habitats. However if body temperature rises above its optimum level (usually around 40„aC in mammals) then the enzyme rate inside the body will go into sharp decline. This is because enzymes are proteins, and become denatured. .....

.... the government forever. The issue of trust between the government and the people is and was at stake. Since it will never really be known what went on in Roswell in 1947, the American people may never fully trust the government again. The Roswell incident is a very sketchy ordeal in which many people have different accounts. There is and was never any doubt that something crash landed. On July 8, 1947 the headline of the Roswell Daily Record read "RAAF Captures Flying Saucer on Ranch in Roswell Region." The next day, the headlines read "Weather balloon was mistaken as UFO." Many people wonder how someone with military experience could mistake a weathe .....

.... is caused by the two atmospheres of Mars. Scientists do know, however, that Mars is relatively small and that changes take place in the surface features when the seasons change. It is also known that dust storms are prevalent and leaves the surface of Mars covered by a red haze. Mars has a very thin atmosphere which is composed of carbon dioxide, nitrogen, argon, water vapor and oxygen. Mars also has no magnetic field. " Because the atmosphere of mars is so thin, wind velocities up to several hundred Km per hour are required to raise the dust particles during a dust storm, and these fast- moving particles erode structures with a sand-blasting effect " (Groli .....

.... plutonium. Such material is coming into high demand on the market. Terrorist, organized crime and countries with nuclear ambition, are high bid contenders for the material. The United States is also becoming involved for the safety of preventing a nuclear disaster. The U.S. has just begun their large task and with Russia's worsening economy, smuggling of nuclear material will continue. During the Cold War the security of Soviet nuclear weapons and missile materials was based on a highly centralized military system and operating within a strong political authority. The workers back then where well disciplined and each individual new his/her role. The .....

.... relation, discovered the different proportions which molecules are formed in (i.e. for every water molecule, one atom of oxygen and two molecules of hydrogen are needed). He also discovered the noble, or inert gases, and their failure to react with other substances. In 1869 a Russian chemist, best known for his development of the periodic law of the properties of the chemical elements (which states that elements show a regular pattern ("periodicity") when they are arranged according to their atomic masses), published his first attempt to classify the known elements. His name was Mendeleyev, and he was a renowned teacher. Because no good textbook in chemistry .....

.... as recorded history show the significant effects earthquakes have had on people's lives. Long before there were scientific theories for the cause of earthquakes, people around the world created folklore to explain them. Until recent times, science has not had a complete understanding of how earthquakes are caused, and what can be done to predict when they will strike. This essay will discuss how earthquakes are formed and occur, how scientists can more accurately predict the arrival of earthquakes. Before contemplating how earthquakes might possibly be prevented, it is essential that the process and formation of and earthquake be understood. Earthquakes .....