What material makes up the planets in our solar system? a. heavy metals created in the big bang b. material that shot out of the sun about 10 billion years ago c. material captured from a passing galaxy about 10 billion years ago d. debris from previous stars which had exploded

The tilt of the earth's axis of rotation is responsible for the a) ocean's tides. b) size of the moon. c) brightness of stars. d) earth’s seasons.

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled