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Zarrin [17]
3 years ago
13

In the last century, the extent of global rain forests has been reduced by _____. one-half

Biology
2 answers:
stepladder [879]3 years ago
5 0
A is your answer, I just got it right o my test figured id help you out
Elodia [21]3 years ago
4 0

The correct answer is - one-half.

In the past century, the deforestation of the rainforests in the world had been devastating, and it is estimated that approximately one half of the tropical rainforests have been destroyed.

The reason for the large scale destruction of the rainforests is mainly because of clearing space for agriculture and for spaces where the cattle can graze. Unfortunately, the people that live the regions where the tropical forests are, are not well educated as to how to manage the land, and a big problem is that the soil of the rainforests is only good for 2-3 seasons, because it spends and erodes very quickly. Because of that, people just continue to clear more and more of it, thus leaving destroyed forest and destroyed soil behind them, without taking in consideration the long term effects.

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A geologist is studying two different rhyolite flows to determine if they were erupted at the same time.
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Q1. The answer is 1.

It can be calculated using the equation:

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x = 50% = 50/100 = 0.5

n = ?

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log((1/2)ⁿ) = log(0.5)

n * log(1/2) = log(0.5)

n * log(0.5) = log(0.5)

n = log(0.5)/log(0.5)

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Q10. The answer is 2.


It can be calculated using the equation:

 (1/2)ⁿ = x

x - decimal amount remaining, 

n - a number of half-lives.


Rhyolite #2 has 25% of the parent H remaining:

x = 25% = 25/100 = 0.25

n = ?

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log((1/2)ⁿ) = log(0.25)

n * log(1/2) = log(0.25)

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n = log(0.25)/log(0.5)

n = -0.602 / - 0.301

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Q3. The answer is 100 million years.


A number of half-lives (n) is a quotient of total time elapsed (t) and length of half-life (H):

n = t/H

n = 1

t = ?

H = 100 000 000 years


n = t/H

t = n * H

t = 1 * 100 000 000 years

t = 100 000 000 years<span>

</span>

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3 years ago
I need this by 7:
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Explanation:

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2 A certain species of snake in an ecosystem consumes frogs, salamanders, and small rodents.
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Answer:

C

Explanation:

I hoped it help u out. Ur welcome :)

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