Which of the following is fansition
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Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

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.

Answer explain why it is not possible to deduce a complete order of reactivity.