Question

1. decaying uranium atoms in earth’s crust result in ____.

o u-235
o explosions
o radon gas
o high-level waste

Explanation:

Uranium-238 (naturally abundant in Earth's crust) decays through a series of steps, one of which produces radon-222, a radioactive gas. U-235 is a uranium isotope, not a product of crustal uranium decay. Explosions are not a natural result of slow crustal uranium decay. High-level waste is human-made nuclear waste, not a natural crustal decay product.

Answer:

○ radon gas