The san andreas fault in california demonstrates earthquakes caused by
the thin lithosphere breaking apart at the edge of a continent
continental collisions and resulting compression forces
oceanic crust being subducted into the mantle
two tectonic plates scraping by each other

Two tectonic plates scraping by each other

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Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.