Which one of the following is a compound? sugar chocolate chip cookies oxygen salt water

why is water considered a pure substance and not a mixture?

water can be separated physically into hydrogen and oxygen.

water is clear.

water can be separated chemically into hydrogen and oxygen.

water is not a pure substance. it is a mixture.

how can a mixture of pigments be separated?

filtration

crystallization

magnetic attraction

chromatography

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

explanation:

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).