.... last ten years, a number of studies on modern and ancient sand seas, or ergs, have increased greatly our understanding of eolian bedform dynamics. Additionally, we can describe trace fossils in the Coconino and relate them to the physical environments of deposition. This provides us with more comprehensive reconstruction of the erg environments. Although the cliff-forming nature of the formation can present certain logical problems, the exceptional three-dimensional exposures in the Grand Canyon give the sedimentologist and ichnologist the opportunity to examine the details .....

.... mineral layers or beds, which are distinguished from each other by differences in thickness, the size of the grains, or color. All rock disintegrate slowly as a result of mechanical weathering and chemical weathering. Mechanical weathering is the breakdown of rock into particles without producing changes in the chemical composition of the minerals in the rock. Ice is the most important agent of mechanical weathering. Water percolates into cracks and fissures within the rock, freezes, and expands. The force exerted by the expansion is sufficient to widen cracks and break o .....

.... of animals during experimentation, but the use of animals in research for the benefit of all people is and always will be justifiable. Over 99 percent of all animal experiments are on rats and mice developed expressly for laboratory use. "Less than 1 percent of experiments involve cats, dogs, farm animals, nonhuman primates, frogs, fish, and birds." ( ¯Encyclopedia of Medicine, AMA®, "Animal Experimentation", Page 110.) Animal rights advocates try to sway public opinion by showing grotesque pictures of destroyed cats, dogs, farm animals, dolphins, and monkeys which .....

.... the dissociation of Ionic Compounds, and the Ionization of Polar Covalent Molecular Substances. The Dissociation of Ionic Compounds is where particles are ionically (electrically) bonded together. They already made out of cations and anions, but in their solid state the ions are locked into position in their crystal structure, and can’t move around. When the ionic compound is dissolved into water the water molecules, which are polar,(having a positive and a negative end) will be attracted to the positive ions. This attraction of different charges will create tension in .....

.... they started leaking. As you can see, there is a great need for a nuclear waste disposal site. These sites may sound frightening, but it may be the only way for us to dispose the devastation we had longed to create. In 1986, the decision for a nuclear waste depositary proved to be "the most frightening decision of the decade." Of these sites, three were chosen to be the "most suitable" for the disposal of nuclear by-products. These three sites consisted of Hanford, Washington; Yuka Mountain, Nevada; and Defsmith, Texas. Hanford, Washington is a low populated U.S. city, a .....

.... into the ocean in a single day.2 The most harmful of these is plastic. Sea mammals such as birds and dolphins often get tangled in the plastic six-pack rings, fishing lines, and net that humans discard into the ocean waters. Once entangled, they are unable to free themselves which can cause deep cuts, starvation, and drowning. Many ocean mammals have died as a result of ingesting these plastic items. In 1985, a sperm whale beached itself on a New Jersey shore; a mylar balloon was lodged in its stomach, and three feet of ribbon in its intestines. Most plastics take hundreds of .....

.... pure platinum. The small, irregular grains that contain the ore also contain other rare metals, such as iridium, osmium, palladium, rhodium, and ruthenium. The grains also contain small amounts of iron, copper, chromium, and titanium. A large nugget of platinum will be found only on occasion, like in 1843, a lump weighing over 21 pounds was found in Russia. Russia produces the worlds largest share of platinum-group metals. Other important sources of platinum are located in the Transvaal province in South Africa and in Sudbury, Ont. Colombia and the United States als .....

.... pressure, the flow of blood from their heart, the heart beat and breathing rate. Cigarette smoke also contains carbon monoxide, the same poisonous gases released from a car exhaust pipe. Carbon monoxide is a colorless and odorless, highly toxic gas that reduces the amount of oxygen that the blood can carry. Combined with the effects produced by the nicotine, it creates an imbalance in the demand for oxygen by the cells and the amount of oxygen the blood is able to supply. Tar is another chemical produced from cigarette smoke. Tar contains at least 30 cancer .....