Question

some rock formations emit a radioactive gas that is responsible for causing lung diseases and death. what is the name of this gas?
helium
hydrogen
nitrogen
radon

Explanation:

Helium is a non - radioactive, inert gas. Hydrogen is a flammable gas and not radioactive. Nitrogen is a non - radioactive, abundant gas in the atmosphere. Radon is a radioactive gas that can be emitted from rock formations and is known to cause lung diseases and death.

Answer:

D. radon