Robert Duncan , -
said about Earth, Old...
"Unfortunately, we haven't found many very old rocks on Earth because our planet's surface is constantly renewed by plate tectonics, coupled with erosion."
- Robert Duncan Read all Robert Duncan quotes, or find out more about Robert Duncan
"Unfortunately, we haven't found many very old rocks on Earth because our planet's surface is constantly renewed by plate tectonics, coupled with erosion."
- Robert Duncan
- Robert Duncan