Question

If a radioactive nuclide has a half-life of 1.3 billion years and it is determined that a rock contains 25% of its original amount of this nuclide, about how old is the rock?

1.3 billion years
2.6 billion years
0.65 billion years
3.9 billion years

Answer 1

@.TH3_M0NST3R.

Answer 2

@PRAETORIAN.10

Answer 3

Yeaaaaaaaaaaaaaah I don't know that mathy stuff...
Prae can help with that, I'm sure.

Answer 4

Biostratigraphy is an important absolute dating technique.

True
False

Answer 5

False I think.

Answer 6

The process of speciation usually requires that

populations of the same organism are isolated for long periods of time
organisms within different populations reproduce with each other
environmental conditions stay the same over long periods of time
an environmental catastrophe takes place, such as when the dinosaurs became extinct

Answer 7

Isolation, I do believe.

Answer 8

Define absolute dating and explain how it is different from relative dating. Explain why relative dating was the only means of dating rocks before the use of absolute dating became common.

Answer 9

last question

Answer 10

^ Dunno.

Answer 11

Deuces !!!!

Answer 12

thx for yo help

Answer 13

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