The coral reef off the coast of Queensland, Australia, in the Coral  Sea is the Great Barrier Reef. It is the world's largest reef  system, composed of over 2,900 individualâ¦ reefs and stretches for  over 1,400 miles over an area of about 133,000 square miles.
KuttÄb means writers, plural katatÄ«b / katÄtÄ«b. In common Modern Arabic usage, maktab means office while maktabah means library or (place of) study and kuttÄb is a plural word meaning books.n the medieval Islamic world, an elementary school was known as a maktab, which dates back to at least the 10th century. Like madrasahs (which referred to higher education), a maktab was often attached to a mosque.
To expand on Muktabh's answer, you need to know the density of the substance to know how to convert from volume to mass, or vice-versa. where [math]\rho[/math] is the density of the object. You also need to make sure your units are correct. For your question, you would need density in units of [math]\frac{mg}{mL}[/math].