Please help asap, thank you!

Off the coast of Ecuador, cold, nutrient-rich water rises from below.

Which of the following best describes this current?

coastal upwelling

thermohaline current

geostrophic current

downwelling

beta decay is the answer

the right answer is c i just did the question.

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.