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The age of rocks on earth or the samples of rocks and dust brought back form the moon can be found by determining the proportion of radioactive ………. In the rock of dust. |
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a) |
Potassium and stable calcium |
b) |
Uranium and stable lead |
|
c) |
Carbon and stable carbon |
d) |
Radium and stable lead |
|
The age of rocks on earth or the samples of rocks and dust brought back form the moon can be found by determining the proportion of radioactive ………. In the rock of dust. |
|||
|
a) |
Potassium and stable calcium |
b) |
Uranium and stable lead |
|
c) |
Carbon and stable carbon |
d) |
Radium and stable lead |