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Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.
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Describe at least two advantages and two disadvantages of using hydropower as a source of energy.
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If you are looking for a substance that will easily dissolve in water, you should look for a substan...
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