Paolo wanted to identify a mineral. He rubbed a corner of the mineral across a white tile and recorded the color of the mark. What property was Paolo measuring? a
cleavage
b
color
c
luster
d
streak

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

copper and glass have high electrical conductivity

the cover letter for a job search includes the skills one has for the particular job. including a cover letter is always a good idea, as it describes the ability to perform a task, and the employer can easily fetch the intention of the job you want to do.  

the cover letter is very important to be included in the job search document. hence, i strongly with the statement.