A ruler-like symbol used to measure distance on a map is a scale. It shows the ratio of the distance on the map to the actual distance.
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It has gone through four half-lives of carbon-14 (5730 years<span> x 4 = </span>22920 years<span>)
It is 22920 years old.
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Exploit is usually means a way considered which "unfair"
ex) security exploit
The crust and the upper mantle.
