Earth is approximately 4.5 billion years old. is it likely that any of the rocks that were on earth's surface when it first formed are still in existence? a. no, most of earth's magma did not solidify until 1 billion years ago. b. yes, earth's surface has changed very little since earth was first formed. c. no, rock material is constantly recycled on earth's surface through the rock cycle. d. yes, rocks are very hard and should be able to survive for 4.5 billion years.