1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lilavasa [31]
3 years ago
5

if an element has a half-life of 30 million years and there is 12.5% of it remaining in a rock, how old is that rock

Biology
1 answer:
Assoli18 [71]3 years ago
3 0

Answer:

The half-life of a substance is the amount of time it takes for half of that substance to decay. However, after two half-lives, half of the half remaining will decay, leaving you with one quarter of the original substance.

So, after 1 million years you will have 50% of the original substance remaining.

And, after 2 million years you will have 25% of the original substance remaining.

After 3 million years you will have 12.5% of the original substance remaining.

And after 4 million years you will have 6.25% of the original substance remaining.

Explanation:

Hope it helps:)

You might be interested in
Increased carbon dioxide in the atmosphere leads to increased absorption of
erik [133]

Answer:

Solar Radiation

Explanation:

Increased carbon dioxide in the atmosphere leads to increased absorption of Solar Radiation.

7 0
2 years ago
How many stops can you potentially make on your trip? Why?
Alecsey [184]
It depends on where your going and how many people are going to the trip. But in my opinion I think about 3 times because you need to make stops when you need to use the restroom and when your hungry.




Sorry if I am not right :(
I hope I helped you have a great day :)
3 0
3 years ago
A cell in early interphase has 10 chromosomes. How many chromatids will the same cell have during prophase?.
Anon25 [30]

Answer:

20

Explanation:

3 0
2 years ago
What happens when an ecosystem is in equilibrium???
andrezito [222]
Ecosystems equilibrium is when populations of organisms in the ecosystem are balanced.
5 0
3 years ago
PLEASE HELP QUICK!!!
schepotkina [342]
1) making haploid cell for sexual reproduction

2)it's long story u can read miosis in text books im sure u will undrestand it if u want I can suggest u some books

3)befor meiosis in interphase
in bacterial cells dividing cell into two control the number of chromosomes in cell in if binary fission takes long time the chromosome of bacteria will replicate again and cell will contain 3 chromosomes from main chromosome but in eukaryotic cell there is inhibition after dna replication that avoid cell to do that

4)2 times

5)I couldn't understand your question
7 0
3 years ago
Other questions:
  • Which of the following is a characteristic of alcoholic fermentation?
    6·2 answers
  • Which meal would provide the most energy, and includes the material needed to build muscle? a. bread and butter b. lettuce and o
    7·1 answer
  • Forests help to regulate the global climate by
    15·1 answer
  • Cual es la funcion de los cloroplasto?
    6·1 answer
  • Examine the animal cells as they are each in a specific phase in their life cycle. Then, identify the phase and what is occuring
    15·1 answer
  • Please help!! Differences between oceanic and continental crusts influence how the plates interact with each other which of the
    15·2 answers
  • Question 7 of 10
    13·1 answer
  • The _____ of the brain is more active during visual imagery encoding. inner left temporal lobe lower left frontal lobe upper lef
    12·1 answer
  • Organic material in soil contains a substance called "humus". Humus is defined as
    8·1 answer
  • Signals from the sense organs are interpreted by the cerebrum, autonomic nervous system, medulla, cerebellum?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!