Porque el hidrógeno y el helio son comunes en todas las estrellas?

Lo siento, este en ingles

Explanation:

Hydrogen and helium are found in all stars. Ninety percent of all atoms in the universe are hydrogen atoms and fusion reactions fuel stars, resulting in the formation of helium and higher atomic number elements. This is the case because of the Big Bang, when temperatures were so high that only energy could exist.

heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.