Which form of precipitation would you predict when you see a cloud shaped like a column in the sky during the summer at an above freezing temperature? Heavy rain and hail
Light rain, sleet, and snow
Heavy snow and strong winds
Clear skies with no precipitation

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.