In what ways do scientists not study the history of Earth's climate?
1 answer:
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Answer:
A. 3 x 10-12
Explanation:
Generally, the parts-per notation is used to represent very small concentration without any specific unit.
Parts per million is notated as
Parts per billion is notated as
Parts per trillion is notated as
Hence, 3 parts per trillion will be written as 3 x
The correct option is A.