Examlex
If you obtained a sample of Martian rock, determined the abundances of 230U and 207Pb in it, and found that for every one uranium atom there were seven lead atoms, then what would the age of this rock be? Note that 230U decays to 207Pb with a half-life of 700 million years. Assume that there was no 207Pb in the rock when it originally formed.
Canada
A country in North America known for its vast landscapes, multicultural population, and as a member of the Commonwealth.
United States
A country comprising 50 states, a federal district, five major self-governing territories, and various possessions, characterized by a federal republic form of government.
Safer Sex
Avoiding sexual behaviours that are considered high risk as well as engaging in various types of nongenital contact.
Passive
Characterized by lack of active response or action, often implying acquiescence or submission.
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