Which factor activates a convection current, starting the flow of a fluid?

a. temperature differences in the mantle.

b. heated liquids at earth’s surface.

c. iron-rich rocks in the mantle.

d. cold temperatures at the north pole.

not sure if this is what you'r looking for nnew= nold

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

what is the statement?