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What is the approximate age of the Earth?
- 2.5 billion years
- 4.5 billion years
- 6.5 billion years
- 10 billion years
Answer: 4.5 billion years
The Earth is approximately 4.54 billion years old, determined through radiometric dating of meteorite material and Earth's oldest rocks. Life appeared about 3.5 billion years ago, and humans (Homo sapiens) evolved only about 300,000 years ago.