A Rock Sample from the Moon Includes a Mineral That

question 31

Multiple Choice

A rock sample from the moon includes a mineral that contains small amounts of the radioactive isotope Potassium- 40 and its daughter element Argon- 40 (half- life of 1.3 billion years) . This mineral would not form with any Argon- 40. Consider a crystal with 7 atoms of Argon- 40 for every 1 atom of Potassium- 40. How long ago did this crystal form?

• A)13.5 billion years ago
• B)1)3 billion years ago
• C)3)9 billion years ago
• D)5)2 billion years ago

---

Definitions:

Anger

A strong feeling of annoyance, displeasure, or hostility, often a response to perceived wrongs or frustrations.

Hostility

Expressing aggression or enmity towards someone or something; often characterized by antagonistic attitudes or actions.

Space Zone

An area designated for a specific use, which can refer to allocations in physical or conceptual spaces such as parking or zoning in cities.

Sales Presentation

A formal pitch or demonstration of a product or service aimed at persuading a potential client to make a purchase.