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what type of hazards do the standard pictograms represent?
select all that apply.

chemical

physical

health

environmental

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

a polar bond is formed when electrons are shared unevenly between atoms