.... oceans. Because fresh water is lighter, or less dense, than salt water, unless the two are mixed by the tides or winds, the fresh water remains at the surface, resulting in a salinity gradient. Tides force seawater inland as a countercurrent and produce a saltwater wedge below the freshwater surface waters (Bellamy 62). Estuaries are always in a state of change and hardly ever in a steady state. The principal energy source are tides, causing estuarine mixing, but wind, wave motions, and river runoff can also be important locally (Braun 45). Salt water and f .....

.... of the more specific types of biology are as follows: Molecular biology, which has made the most fundamental contributions to modern biology; Cellular biology, which is closely linked with molecular biology. Cellular biology deals with the functions of the cell and the basic strucural unit of living matter; Finally, population biology became firmly established as a major sub division of biological studies in the 1970’s. This field relates with the study of gene changes in populations, and ecology. Biology also includes the study of humans at the molecular, .....

.... community but he was also despised by many because of his background and because of his attitude towards others. Darwin was well respected by the intellectual community, but the difference was the way they conducted themselves when they were dealing with their hypothesizes. Galileo's Hypothesis Galileo was well known for standing up for what he believed in and pushing the things he wanted. He was constantly writing letters and engaging in debates over the issue of Copernicanism. Galileo's entire reason for doing this was to make the scientific and .....

.... trees is continued without any regulation, the forests will all be gone in ten years, so we should do mankind a favor and try to preserve what is left. If the old growth forests are gone, then they can never return because it takes over five generations to produce one and at the rate that the human population is increasing, there is not enough land to have a secure place for a new forest. If we realize that it is best for the human race to stop destroying the natural resources, then we must destroy, too, the existence of loggers all together. To do so, there m .....

.... Most laundry detergents contain approximately 35% to 75% sodium triphosphate (Na5P3O10), which serves two purposes. Providing an alkaline solution (pH 9.0 to 10.5) is necessary for effective cleansing and also to tie up calcium and magnesium ions found in natural waters and prevent them from interfering with the cleansing role of the detergent. Eutrophication is the progressive over-fertilization of water, in which festering masses of algae's blooms, choking rivers and lakes. Phosphorus compounds act as a fertilizer for all plant life, whether free-fl .....

.... ten meters deep. Atolls, on the other hand, are formed far offshore and they make a ring-shaped reef that close a circular lagoon. Coral reefs are the largest biological structures on the planet, with the largest being the Great Barrier Reef covering over 2000 kilometers along the East Coast of Australia. The reef is said to be 500,000 to 2,500,000 years old and is said to be visible from the moon. There is only one problem with this beautiful structure and that is the carelessness of man. Silt from deforested lands and pollution from crowded coastlines choke .....

.... 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 large dams have been well documented for some time now, in case after case, new ones are proposed whose environmental impacts are downp .....

.... p.2) The brain consists of nerve cells or neurons. Each neuron has an electrically charged part. It receives electrical signals from other neurons, and passes them to others. All the functions of the brain depend on electrical signals that are send from one neuron to another. The normal brain generates an electrical rhythm in order way and this order in epilepsy is broken by some neurons discharging signals. Because of some genetic defect there will occur a short electrical storm that is caused by neurons and the subject will get a seizure. This condition i .....