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Rashid [163]
2 years ago
9

Write down at least two pieces of evidence showing that Earth’s atmospheres or oceans have changed over time. Provide reasoning

for each piece of evidence.
I can't think of any examples :/

EDMENTUM Earth & Space Science
History
1 answer:
Ksivusya [100]2 years ago
5 0

Answer: At the point when earth was first framed, its environment was reasonable made out of hydrogen, helium, and different gases that contained hydrogen. ... Throughout an immense measure of time, a long period of time, the earth steadily cooled. At the point when the temperature dropped enough, water fume consolidated and went from a gas to fluid structure. This made mists.

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3 years ago
The half-life of polonium-218 is 3 min. if you start with 16 mg, how long will it be before only 1.0 mg remains?
babymother [125]
The decay equation is of the form
m(t) = m_{0} e^{-kt}
where
m(t) = the mass remaining after t minutes
m₀ =  the initial mass
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e^{-3k} = \frac{1}{2}
Therefore
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k = ln(0.5)/(-3) = 0.231

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e^{-0.231t} =  \frac{0.1}{16} =0.00625 \\\\
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Answer: 22 min (nearest integer)

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Answer:

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