Which of the Following Statements Is a Characteristic of Environmental

Multiple Choice

Which of the following statements is a characteristic of environmental radioactivity?

A) Much of the Earth's interior heat comes from alpha decay.
B) There was no environmental radioactivity before the discovery of nuclear energy by humans.
C) All elements have both radioactive and stable isotopes.
D) Radon atoms will sink in water.
E) Much of Earth's interior heat comes from beta decay.