Physical properties include the state of matter. We know these states as solid, liquid, or gas. Properties can also include color and odor. For example, oxygen is a gas. It is a major part of the air we breathe. It is colorless and odorless. Chlorine is also a gas. In contrast to oxygen, chlorine is greenish in color. It has a strong, sharp odor. Have you ever smelled cleaning products used around your home? If so, you have probably smelled chlorine. Another place you might smell chlorine is at a public swimming pool. The chlorine is used to kill bacteria that may grow in the water. Other physical properties include hardness, freezing, and boiling points. Some substances have the ability to dissolve in other substances. Some substances cannot be dissolved. For example, salt easily dissolves in water. Oil does not dissolve in water.
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QUESTION: What are the physical properties of matter?

As his car slid downtown on Tuesday morning the mind of Arnold Thorndike was occupied with such details of daily routine as the purchase of a railroad, the Japanese loan, the new wing to his art gallery, and an attack that morning, in his own newspaper, upon his pet trust. But his busy mind was not too occupied to return the salutes of the traffic policemen who cleared the way for him. Or, by some genius of memory, to recall the fact that it was on this morning young Spear was to be sentenced for theft. It was a charming morning. The spring was at full tide, and the air was sweet and clean. Mr. Thorndike considered whimsically that to send a man to jail with the memory of such a morning clinging to him was adding a year to his sentence. He regretted he had not given the probation officer a stronger letter. He remembered the young man now, and favorably. A shy, silent youth, deft in work, and at other times conscious and embarrassed. But that, on the part of a stenographer, in the presence of the Wisest Man in Wall Street, was not unnatural. On occasions, Mr. Thorndike had put even royalty frayed, impecunious royalty, on the lookout for a loanat its ease. The hood of the car was down, and the taste of the air, warmed by the sun, was grateful. It was at this time, a year before, that young Spear picked the spring flowers to take to his mother. A year from now where would young Spear be? It was characteristic of the great man to act quickly, so quickly that his friends declared he was a slave to impulse. It was these same impulses, leading so invariably to success, that made his enemies call him the Wisest Man. He leaned forward and touched the chauffeur's shoulder. "Stop at the Court of General Sessions," he commanded. What he proposed to do would take but a few minutes. A word, a personal word from him to the district attorney, or the judge, would be enough.
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QUESTION: How does Mr. Thorndike act upon his impulse?

Catherine V. "Ginny" Kilgore of Oxford, an attorney with North Mississippi Rural Legal Services, has been recognized for her dedication to serving the indigent. Kilgore - who oversees delivering legal services to the disabled and elderly in 39 north Mississippi counties - is recipient of the University of Mississippi School of Law's 2002 Public Service Award. The award was announced recently at a dinne r, held in Kilgore's honor and hosted by law school Dean Samuel M. Davis, who presented her with an engraved plaque. "Ginny Kilgore is a public servant in the truest sense," said Davis. "Her selection continues the tradition of this award in recognizing those who have labored in the trenches, with little or no compensation but with great professional and personal satisfaction in helping to bring justice and equality to those who need it most." "This award means a great deal to me," Kilgore said, pointing to others so honored. "The work of those who received the award before me has been so important; I feel very honored." After earning bachelor's and master's degrees in education and a few years teaching, Kilgore enrolled at the UM law school. Upon graduation in 1975, she entered private law practice in Oxford, joining NMRLS in 1978. Since then, she has earned promotions from managing attorney, senior attorney, then director of the Council on Aging project. Since 1990, she has worked in the Administrative Law Unit and Resource Development, and directed the Elder Law Project, serving the northern half of the state. She also is an adjunct professor in the UM law school's Civil Law Clinic. She held a similar post a few years ago in the school's Elder Law Clinic. Kilgore says she's found her niche. "I've always thought it was important to do work to help people. I really enjoy it. The issues I've dealt with through the years have been on the side of helping people maintain the basics of life - home, healt h care, jobs and family." She says her desire to serve others was sparked early, growing up in a single-parent home, aware that her widowed mother faced certain challenges as she supported her four children through public school and college.
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QUESTION: Where has Catherine V. "Ginny" Kilgore worked?

Heat supplies the energy that causes motion. The deeper you go into toward the Earths core, the hotter it gets. At the core it is really hot. All that heat tries to rise toward the surface. In the Mantle, the rock is partially melted and is able to move. As it is heated, the material in the mantle moves toward the surface. As the mantle material rises, it cools. When it reaches the Earths crust, it is mostly stopped. A little of the material can break through the surface, but not all. Instead, it begins to move horizontally. The mantle material moves horizontally away from a mid-ocean ridge crest. Toward the surface, the mantle material starts to cool. As it cools it sinks back down into the mantle. These areas are where deep sea trench occur. The material sinks back down to the core. The system operates like a giant conveyor belt. The motion due to heating and cooling is called convection.
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QUESTION:
What happens when the mantle material that is near the surface starts to cool?