.... and geologists; specification of the system is necessary in the description of each crystal system. Isometric This system comprises crystals with three axes, all perpendicular to one another and all have equal length. Tetragonal This system comprises crystals with three axes, all perpendicular to one another; but only two are equal in length. Orthorhombic This system comprises crystals with three mutually perpendicular axes, all of different lengths. Monoclinic This system comprises crystals with three axes, all unequal in length, two o which are no .....

.... Snowy Owl, and unfortunately hunderds of more. The death of these animals each year are all different and sometimes so simple. There are two different kinds of causes that drastically cut Down the number of these endangered species: Direct Causes Direct Causes is when the animals are purposely hunted, trapped, fished, whaled, or seled to extinction. Hunting for sport has been responsible for endangering such animals as the Polar Bear and the Siberian Tiger. But the endangerment of most species that are hunted or trapped today results mainly of commercial acti .....

.... universe is still expanding, as astronomers have observed. The Steady State model says that the universe does not evolve or change in time. There was no beginning in the past, nor will there be change in the future. This model assumes the perfect cosmological principle. This principle says that the universe is the same everywhere on the large scale, at all times.2 It maintains the same average density of matter forever. There are observational evidences found that can prove the Big Bang model is more reasonable than the Steady State model. First, the redshif .....

.... They cut America's demand for imported oil by nearly 100 million barrels a year—reducing our dependence on foreign oil suppliers and cutting our trade deficit. The future looks even better. Advanced-design nuclear power plants are now being developed—quicker and less costly to build, better performing, and even safer than today's plants. These plants will supply our children's and grandchildren's electricity—while helping to protect their environment. Cheers For Energy Efficiency We Americans should be proud of ourselves. Since the 1973 .....

.... then it is doubtful that you will ever live up to your potential. Traits such as what you look like are inherited from your parents. Your potential is also inherited from your parents. Chromosomes contain the information of a person's potential height, potential strength against disease, and other physical characteristics. A human being has 23 pairs of chromosomes in every cell in his or her body (except reproductive cells). If, during a stage of growth, a fetus somehow loses one of these chromosomes, the baby may die, or have a birth defect. Since t .....

.... of electrical charges, and is essential to the understanding of electricity. A third idea was that if the distance between electric charges is increased, the force of attraction or repulsion decreases. All matter is made up of very tiny particles called atoms. Atoms are made up of even smaller substances called subatomic particles. Scientific studies have found that some of these subatomic particles are charged with electricity. The electric charges are made up of two kinds - positive and negative. The positively charged particles are called protons, and the .....

.... columns of the pier. The waves of the sea represent the sunlight. We know that the sunlight is a blend of lights of many colors - as we can prove for ourselves by passing it through a prism, or even through a jug of water, or as Nature demonstrates to us when she passes it through the raindrops of a summer shower and produces a rainbow. We also know that light consists of waves, and that the different colors of light are produced by waves of different lengths, red light by long waves and blue light by short waves. The mixture of waves which constitutes sun .....

.... ordinary arithmetic operations can be performed. The next innovation in computers took place in 1694 when Blaise Pascal invented the first "digital calculating machine". It could only add numbers and they had to be entered by turning dials. It was designed to help Pascal's father who was a tax collector. In the early 1800's, a mathematics professor named Charles Babbage designed an automatic calculation machine. It was steam powered and could store up to 1000 50-digit numbers. Built in to his machine were operations that included everything a modern general .....