The ultimate environmental hazard to mankind is

Which of the following causes mutations at a high rate?

$X$ is a highly potent pollutant and should be buried at a depth of $Y$ meters below the Earth's surface.

Which of the following problems are associated with nuclear power plants?

Explain about radioactive wastes.

Which of the following statement$(s)$ is/are correct?
$(i)$ Nuclear energy is a non-polluting way of generating electricity.
$(ii)$ Radioactive waste leakage incidents occurred at Three Mile Island and Chernobyl.
$(iii)$ Prolonged exposure to radioactive waste can cause cancer.
$(iv)$ Radioactive waste is recyclable.
$(v)$ High doses of radiation are lethal.