What is the approximate age of the Earth?

The approximate age of the Earth is estimated to be about 4.54 billion years. This figure is derived from various forms of radiometric dating, including the dating of the oldest rocks on Earth and meteorites that have fallen to Earth. The process involves measuring the decay of radioactive isotopes and using the principles of geology to understand Earth's formation and history.

The choice of 4 billion years reflects the consensus among scientists based on extensive research and is supported by numerous geological and astronomical studies. This age helps scientists understand Earth's development, its geological activity, and the evolution of life.

In contrast, the other options significantly underestimate the age of the Earth. For example, 2 billion years and 3 billion years do not account for the comprehensive scientific evidence that shows how the Earth has evolved over a much longer timeframe. Similarly, 5 billion years overshoots the current scientific consensus and understanding of Earth's formation and the solar system's history. Overall, the selection of 4 billion years is well supported by robust scientific evidence, making it the accurate choice.