The potassium remaining is 1/4 of the original, so two half lives have passed.
One half life = 1.25 billion years
Two half lives = 1.25 x 2 = 2.5 billion years
The tools are 2.5 billion years old.
Answer:
stars are large grouping ans stars form from the same nebula and also they are about the distance the earth
Explanation:
Answer:
the following is not a Metamorphic agent is lithification
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