Can someone explain how I’m supposed to do this please I don’t understand molarity

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.

Explain that newton first law, second law and third law of motion?

Which statement best explains the relationship between an area is geography and the temperature of its surface water