Answer;
The Huronian Supergroup <span>is </span>particularly<span> exciting and </span>interesting<span> because, by chance, these </span>rocks<span> were laid down at a period when the atmosphere underwent a transition from containing no free oxygen to containing at least some free oxygen.”
</span> Explanation;
The Huronian
Supergroup, a massive
formation of rock laid down
gradually between about
2.5 billion and 2.2 billion
years ago, precisely the
period when oxygen
began to accumulate in the
atmosphere. The Huronian Supergroup is 10 or 11
kilometers (six or seven
miles) thick and extends well below ground
Answer:
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A nervous person is someone who gets awkward easily around people, they tend to stay quiet and to their self. they don’t speak very often, they are probably staring around or not even looking at anyone at all. these type of people aren’t necessarily socially awkward they just get weird around new people or people they don’t feel entirely comfortable with.