The terrestrial planets are made almost entirely of elements heavier than hydrogen and helium.According to modern science,where did these elements come from?
A)They were produced by stars that lived and died before our solar system was born.
B)They were produced by gravity in the solar nebula as it collapsed.
C)They have been present in the universe since its birth.
D)They were made by chemical reactions in interstellar gas.

Question

Quizplus · Accepted Answer

Elements heavier than hydrogen and helium are created through the process of nuclear fusion. These elements are produced by stars during their lifetime and are distributed into space when the star dies in a supernova explosion. These elements then become the building blocks for new stars and planets, including the terrestrial planets in our own solar system.

The Terrestrial Planets Are Made Almost Entirely of Elements Heavier