Energy is transferred from the sun to earth mainly by?

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A) molecular collisions
B) density currents
C) electromagnetic waves
D) red shifts
what is the answer and most importantly why?

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Petrusclavus

C – radiation, sunlight.
Not A because it is vacuum and no molecular collisions possible.
Not B because it is a vacuum
I have no idea what D can refer to in this context.

Rude Dog

uuhhh, EM radiation, perhaps

Ted H

C) electromagnetic waves
Heat travels from the sun by a process called radiation. Radiation is the transfer of heat by electromagnetic waves. When infrared rays strike a material, the molecules in that material move faster.
http://www.uwsp.edu/cnr/wcee/keep/Mod1/Rules/EnTransfer.htm

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