The majority of helium originating in the dust cloud that formed the Earth has since evaporated into space. Most present-day terrestrially available helium comes from which of the following?
W) Nuclear fusion reactors
X) A by-product of nuclear fission
Y) Harvested from the ionosphere
Z) Radioactive decay of heavier elements
✔️Answer:Z) RADIOACTIVE DECAY OF HEAVIER ELEMENTS
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