Which statement best explains how atmospheric
dust particles influence the water cycle?
(1) dust particles are the main source of
dissolved salts in the sea.
(2) dust particles increase the capacity of the
atmosphere to hold water vapor.
(3) dust particles increase the amount of
evaporation that takes place.
(4) dust particles provide surfaces on which
water vapor can condense.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

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