is a very common metal, still used widely today. It was first discovered by Hans Christian Oersted at Denmark in 1825. Oersted reacted aluminum chloride with potassium amalgam. Heating these two substances under reduced pressure caused the mercury to boil away, leaving aluminum metal as the final solution. Ancient Greeks a...
Internet has been the most popular and widely used tool for fetching information on the net. However, another information system is surging in popularity, especially among business organizations and large corporations. The information system is called the . What is an ? What is not an ? And what is its role in the information age? These questio...
" brain" Critically evaluate this statement. The question of how animals and humans navigate is a fundamental research problem upon which there has been much experimentation and debate, and so it is necessary to refine the title to a specific point. As Tolman (1948) established that rats can solve spatial problems too complex for a...
Darwinism Darwinism, a scientific theory that supported the belief of evolution, was manipulated and applied to different areas of life, and thus it became the shaping force in European thought in the last half of the nineteenth century. Darwin, through observation of organisms, determined that a system of natural selection controlled th...
The greenhouse effect occurs when gases such as methane, carbon dioxide, nitrogen oxide and CFCs trap heat in the atmosphere by acting as a pane of glass in a car. _The glass_ lets the sun light in to make heat but when the heat tries to get out the gases absorb the heat. Holding this heat in causes heat waves, droughts and...