Problem: The oldest rocks on Earth are only about 4 billion years old, and these are few and hard to find. Most of the rocks on the surface of the Earth are a great deal younger. Why is this? Need Assignment Help?
- Because radioactive dating techniques only work on rocks that exist in a vacuum like on the Moon.
- Because aliens have re-paved the surface of the Earth with new, young rock.
- Because radioactive dating dates to when the rock was molten last and the Earth's surface is constantly changing because of volcanic activity.
- Because the elements that formed the Earth sank to the core of the Earth and therefore what is on the surface appears young.
- Because the Earth constantly being bombarded by new rocks that cover its surface with young-dating rocks.