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Inessa05 [86]
4 years ago
14

Can u help with tee rock part and plz asap I really need help

Biology
2 answers:
stiks02 [169]4 years ago
7 0
Here, Left amount of Uranium = 1/4

So, Number of Half lives gone by = 1/2 / 1/4 = 2

Life after 1 half-life = 1.3 billion years
So, With 2 half-lives, it would be: 1.3 * 2 = 2.6 billion years

In short, The Rock is 2.6 billion Years Old

For second question, "<span>sea floor spreading and plate tectonics indicate that the continents do move or shift" and it is the basic principle of Continental drift theory.
</span>
Hope this helps!
gavmur [86]4 years ago
3 0
Half-life = time in which half of material is lost

1/4 = 1/2 x 1/2 so 2 half lives have gone by if only 1/4 of it is left.

age of rock = 2 x half life = 2x1.3 = 2.6 billion years.
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