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ahrayia [7]
3 years ago
15

The ocean is constantly circulating about the Earth. a. True b. False

Geography
2 answers:
frosja888 [35]3 years ago
7 0
It is true 
your answer

Eddi Din [679]3 years ago
5 0

A. True it can't be false

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Which is the main goal of social protections?
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Answer:

C. To prevent the suppression of Citizen rights in a country.

Explanation:

Social protections are offered from the government to protect the citizens while they are in another country.

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What landform develops on coral reefs as a result of wave action?
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3 years ago
Need help asap!
slava [35]

More than 75 percent

Explanation:

Let us carefully analyze this problem:

The half life of the rubidium isotope = 50 billion years

   The half-life of a radioactive isotope is the time it takes for it to decay to half of its original amount.

  Every 50years, we know that a rubidium isotope would split into half.

Initially when the isotope was formed, we would only have the parent atoms there. There wont be any daughter;

  ratio of parent to daughter = 100 : 0

When the isotope decays to half; we would have equal number of parent and daughter:

  ratio of parent to daughter at half life = 50 : 50

The age of the earth is about 4.6billion years;

this is;

          \frac{4.6}{50} x 100 = 9.2% of the half-life of the rubidium isotope.

At this time, we should know that only 9.2 percent of the daughter would have been formed.

The remaining parent would be 100 - 9.2 = 90.8% would still be left undecayed.

The ratio of parent to daughter  = 90.8 : 9.2

This is more than 75% of the parent

learn more

Radioactive decay brainly.com/question/10125168

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3 years ago
__________ is a system of canals and devices to limit, store, and move water.
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The source of soil are called?
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The source of soil is called parent material.
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