The dating of rocks is done by calculating the ratio between

Options

A. (a) Uranium-lead
B. (b) Potassium-argon
C. (c) Rubidium-strontium
D. (d) All the above

Answer

**Step-by-Step Solution:**

1. **Understanding Rock Dating**: The process of dating rocks involves determining their age, which is crucial for studying the history of life on Earth and understanding evolution.

2. **Methods of Dating Rocks**: There are two primary methods used for dating rocks:
- **Carbon Dating**: This method is used to date organic materials by measuring the ratio of carbon isotopes, particularly Carbon-14, in the sample.
- **Radioactive Decay**: This method involves measuring the decay of radioactive minerals. The age of the rock is determined by calculating the ratio of parent isotopes to daughter isotopes.

3. **Radioactive Minerals**: Some common radioactive minerals used in dating include:
- **Uranium-Lead Dating**: This method calculates the ratio of Uranium to Lead to determine the age of the rock.
- **Potassium-Argon Dating**: This method uses the ratio of Potassium to Argon.
- **Rubidium-Strontium Dating**: This method involves measuring the ratio of Rubidium to Strontium.

4. **Conclusion**: Since the question asks about the ratio used in dating rocks, the correct answer is that dating is done by calculating the ratios of various radioactive minerals, including Uranium-Lead, Potassium-Argon, and Rubidium-Strontium.

5. **Final Answer**: The correct option is (d) all of the above, as all mentioned ratios are used in the dating of rocks.

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