2. A copper wire can conduct electricity whether the wire is very thin or very thick. Is electrical conductivity an
extensive property or an intensive property?

Intensive

Explanation:

The electrical conductivity of a wire depends on its composition, not the length of the wire.

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

explanation:

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.