The oldest mineral discovered so far is which of the following, which dates back to 4.4 billion years?
Correct answer: B. Zircon
- A. Iron
- B. Zircon
- C. Diamond
- D. Cadmium
Explanation
Zircon is the correct answer because it is the oldest known mineral, dating back to about 4.4 billion years. This makes it a critical component in understanding the early conditions of the Earth's crust. Iron, while a significant element, does not have such ancient mineral forms and was utilised much later in human history. Diamonds, although ancient, do not date back as far as zircon and have a different geological origin and formation process. Cadmium is a metal discovered in the 19th century and is not relevant to ancient geological history.
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Evolution describes heritable change in populations over generations through variation, natural selection and adaptation. Lamarckism explains inheritance of acquired characteristics, while Darwinism explains selection of favourable inherited variations; these historical explanations must not be confused with the modern genetic account of evolutionary change.
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