"# 4 - How do we know without a doubt the world is billions of years old ?"
"All of the evidence from a variety of sources indicates that it is so . Cosmology , astrophysics , nuclear physics , geology and so on all indicate that the earth is old . In fact , the earth looks quite old with some mountains that have been greatly eroded ."
"How do we know without a doubt the world is billions of years old"
"the earth looks quite old with some mountains that have been greatly eroded"