1.3 assessment scientific methods

In 2002, the rare earth elements mine in mountain pass, california was closed because

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

What metric units would you use to measure the thickness of a key