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Elis [28]
2 years ago
7

Submarine canyons:

Geography
1 answer:
Strike441 [17]2 years ago
8 0

Answer:

question 1 is C

question 2 is D

question 3 is B

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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

#learnwithBrainly

4 0
3 years ago
Why does a year consist of 365 days and a day of 24 hours?
gulaghasi [49]
The reason why the year consists of 365 days is because it takes 365 days for our planet to make one full revolution around the sun and the reason why the day consists of 24 hours is because it takes 24 hours for our planet to make one full rotation.  
7 0
3 years ago
How was greece divieled for governance?​
vlabodo [156]

Answer:

Greece is a parliamentary representative democratic republic with a multi-party system, with the President of Greece as head of state and the Prime Minister of Greece as head of government. Both the administration and the Hellenic Parliament have legislative power.

Explanation:

Hope this helps you!!!! :D

4 0
2 years ago
how long does a parcel of water take to complete the journey through the ocean conveyor belt on average?
belka [17]
1,000 years or 10 centuries
4 0
2 years ago
Most sedimentary rocks are readily dated by radiometric methods.<br> a) true<br> b) false
Delicious77 [7]

Answer:

Most sedimentary rocks are readily dated by radiometric methods.

False

Explanation:

hope it helps

7 0
3 years ago
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