Describe the process of nuclear decay. How is it related to half-life, and how is half-life related to the age of a sample?

One does not belong why? ice, gold ,wood ,diamond and table salt

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two