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, rock material is constantly recycled on Earth's surface through the rock cycle.
B.
No, most of Earth's magma did not solidify until 1 billion years ago.
C.
Yes, Earth's surface has changed very little since Earth was first formed.
D.
Yes, rocks are very hard and should be able to survive for 4.5 billion years.

it should be all of them because it asks if you included all of those in your answer

explanation:

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally