What causes convection currents to occur on earth? A. Cool air rising, warm air sinking

B. Cool air rising, but warm air rising

C. Warm air rising, cool air sinking

D. Warm air sinking, cool air sinking

Is d warm air ;-;(//)/(/(/(

I'm sorry to hear that. i will try to answer your other questions if it is within my ability. : )answers: my favourite colour is black.my favourite food is pasta.my favourite school subject is english, but i do also like lunch time.my least favourite subject is history as well as geography. i have currently garnered a quite equal hatred for both of the subjects.what about you? well, you for the points. : )