Which best describes proper disposal technique?
a bin should be labeled "chemical wastes and hazardous waste."
a bin should be labeled "chemical wastes and broken glass."
students should know proper disposal of the chemicals they use,
students can dispose of all chemicals in the sink.

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?