In an Unweathered Sample of Rock,the Ratio of an Unstable

question 43

Multiple Choice

In an unweathered sample of rock,the ratio of an unstable isotope to its stable daughter isotope is 1:15.If no daughters were present at the time the rock cooled below closure temperature,and the half-life of the isotope is 50 million years,how old is the rock?

• A)200 million years
• B)400 million years
• C)750 million years
• D)1 billion years

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Poverty Line

The minimum level of income deemed adequate in a particular country, below which individuals are considered to live in poverty.

Poverty Line

The lowest amount of income considered sufficient for a basic standard of living in a specific country, under which an individual is classified as impoverished.

Poverty Rate

The proportion of the population living below the poverty line, indicating the percentage of people whose income is insufficient to meet the basic needs such as food, shelter, and clothing.

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An ethno-linguistic group of people traditionally linked to countries that are Spanish-speaking, primarily located in Latin America, but also significantly represented in the United States.