Which event is part of a convection current in the air? A. Cool air sinks.
B. Cool air rises.
C. Warm air swirls.
D. Warm air sinks

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.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

Heat is the total potential energy of a substance that can be transferred. true false