Question

question 10
most of the radioactivity we personally encounter comes from
fallout from past and present testing of nuclear weapons.
nuclear power plants.
medical x rays.
the natural environment.

Explanation:

Radioactivity from natural sources (like radon, uranium in rocks/soil, cosmic rays) is the primary source we encounter daily. Fallout from nuclear weapons testing, nuclear power plants, and medical X - rays contribute much less compared to natural background radiation.

Answer:

D. the natural environment.