Answer the following question given this paragraph: Metal exposed to the outside elements will usually corrode if not protected. The corrosion process is a series of redox reactions involving the metal of the sculpture. In some situations, the metals are deliberately left unprotected so that the surface will undergo changes that may enhance the esthetic value of the work. Q: What process typically occurs to metal exposed to outside elements? Choices: - shrinkage - extraction - explosion - corrosion A:
corrosion
Answer the following question given this paragraph: assigned a unique one-, two-, or three-letter symbol. The names of the elements are listed in the periodic table, along with their symbols, atomic numbers, and atomic masses. The chemistry of each element is determined by its number of protons and electrons. In a neutral atom, the number of electrons equals the number of protons. Q: The chemistry of each element is determined by its number of what? Choices: - nuclei and neutrons - protons and neutrons - electrons and neutrons - protons and electrons A:
protons and electrons
Q: Answer the following question given this paragraph: Q: Drip iirigation requires less water and reduces what? Choices: - moisture - bacteria - sediment - salinization A:
A: salinization
Question: Answer the following question given this paragraph: Human Biology provides an overview of the physiology of humans, from the skin inward. In addition to the skin, the skeletal, muscular, nervous, circulatory, respiratory, digestive, excretory, immune, and reproductive systems are described. Q: What branch of science offers an overview of the physiology of humans? Choices: - marine biology - geology - engineer - human biology A:
Answer: human biology
*Question*
Answer the following question given this paragraph: People with osteoporosis have an increased risk of bone fractures. A bone fracture is a crack or break in bone. Even if you have healthy bones, you may fracture a bone if too much stress is placed on it. This could happen in a car crash or while playing a sport. Wearing a seatbelt when you ride in a motor vehicle and wearing safety gear when you play sports may help prevent bone fractures. Q: People with osteoporosis have an increase risk of what? Choices: - cancer - muscle loss - weight loss - bone fractures A:
**Answer**
bone fractures
Q: Answer the following question given this paragraph: carbon fiberepoxy and boron fiberepoxy composites. Compared with metals, these materials are 25% 50% lighter and thus reduce operating costs. Similarly, the space shuttle payload bay doors and panels are made of a carbon fiberepoxy composite. The structure of the Boeing 787 has been described as essentially one giant macromolecule, where everything is fastened through cross-linked chemical bonds reinforced with carbon fiber. Metal-matrix composites consist of metals or metal alloys reinforced with fibers. They offer significant advantages for high-temperature applications but pose major manufacturing challenges. For example, obtaining a uniform distribution and alignment of the reinforcing fibers can be difficult, and because organic polymers cannot survive the high temperatures of molten metals, only fibers composed of boron, carbon, or ceramic (such as silicon carbide) can be used. Aluminum alloys reinforced with boron fibers are used in the aerospace industry, where their strength and lightweight properties make up for their relatively high cost. The skins of hypersonic aircraft and structural units in the space shuttle are made of metal-matrix composites. Ceramic-matrix composites contain ceramic fibers in a ceramic matrix material. A typical example is alumina reinforced with silicon carbide fibers. Combining the two very high-melting-point materials results in a composite that has excellent thermal stability, great strength, and corrosion resistance, while the SiC fibers reduce brittleness and cracking. Consequently, these materials are used in very hightemperature applications, such as the leading edge of wings of hypersonic airplanes and jet engine parts. They are also used in the protective ceramic tiles on the space shuttle, which contain short fibers of pure SiO2 mixed with fibers of an aluminumboronsilicate ceramic. These tiles are excellent thermal insulators and extremely light (their density is only about 0.2 g/cm3). Although their surface reaches a temperature of about 1250C during... Q: The structure of the boeing 787 has been described as essentially one giant macromolecule, where everything is fastened through cross-linked chemical bonds reinforced with this? Choices: - nitrogen fiber - non-covalent interaction - metal-metal bonds - carbon fiber A:
A: carbon fiber