Finish the paragraph below by filling in the blanks:

Question

"The further we go back in time, the less rock and __________ information we have. This is because Earth’s oldest rocks have undergone great changes over the past few __________ years. Many of the oldest rocks have either been buried deep below the surface or __________ in Earth’s hot interior."

Answer 1

"The further we go back in time, the less rock and fossil information we have. This is because Earth’s oldest rocks have undergone great changes over the past few billion years. Many of the oldest rocks have either been buried deep below the surface or melted in Earth’s hot interior."