Elements emit colours when heated because electrons in atoms can have only certain allowed energies.Heating an atom excites its electrons and they jump to higher energy levels. When the electrons return to lower energy levels, they emit energy in the form of light. Every element has a different number of electrons and a different set of energy levels. Thus, each element emits its own set of colours. See, for example, mercury and neon above. Those colours are as distinctive to each element as fingerprints are to people.
Answer: your answer is C- the subject line.
Explanation:
in a professional email, you should not use emoticons there as it looks unprofessional. so A is incorrect. the domain is who you are, and who the letter is from. B just doesn't make sense. C the subject line is correct. The subject line is the part that you should try to be brief but highly descriptive. Software that people commonly use in the workplace to make their lives easier. D the bcc is when you are wanting to copy someone else's writing in a word document or on paper. this option does not make sense either.
Answer:
First is the high cost, because it takes a lot of increasingly expensive energy to remove salt from seawater. A second problem is that pumping large volumes of seawater through pipes and using chemicals to sterilize the water and keep down algae growth kills many marine organisms and also requires large inputs of energy (and thus money) to run the pumps. A third problem is that desalination produces huge quantities of salty wastewater that must go somewhere.
Explanation: hope this helped
