Explain the design and function of a sponge.

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.

How do you know when a chemical reaction has occurred

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?