Explanation:
A) How much of the parent (X) and how much of the daughter (Y) were present at the time the rock formed? Choose one of the following and explain why
Answer : C) X = 100 % ; Y = 0 %
At the time when the rock was formed, we would have 100% of the parent and 0% of the daughter.
When a radioactive element in rock initially crystallizes, we will only have the parent isotope inside with no trace of the daughter isotope.
A radioactive material is one that spontaneously disintegrates. It produces the daughter stable isotopes as it emits radiations in the process.
The daughter isotope is the stable form of the parent. So when a rock forms, the daughter would not have been produced.
B) X = 50 % ; Y = 50 %
After the time 5730yrs has elapsed, we are going to have both daughter and parent in the ratio 50% to 50%.
The half-life is the time taken for half of a radioactive isotope to decay to half of its original component.
When a radioactive element is decomposing, it will produce daughter isotopes.
At the half-life time, the parent would have disintegrated by half and produced half of the daughter.
learn more:
Half life brainly.com/question/1695370
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1. it is measured by how many people live per square mile of an area.
2. One is the abundance of grocery stores and water to support a large or growing population of people. Another is the amount of schools or colleges to encore growing families to live near by. Third of all is access to public safety, such as reassurance from fire and police departments, and hospitals. Climate is one of the most important and what stores to have to accommodate the residents. Fifth would be tourism and how neat/ sanitary the location would have to look. Finally, good soil to grow crops.
3. (i’m not very sure about this one since i think you have to do that)
4. If we had more available resources and a healthier Earth, yes we would be able to live longer. However, factors like air pollution will affect the human population along with plants and animals.
B. Some processes that shape the Earth are happening so slowly they cannot be easily detected in a human's lifetime.
Explanation:
The processes that shapes the earth are happening so slowly they cannot easily be detected in a human's lifetime.
This is very through and it is very essential for understanding geologic processes.
- This was postulated by James Hutton a Scottish geologist.
- His principle of uniformitarianism .
- The principle of uniformitarianism states that "the present is the key to the past and that the processes occurring today have occurred in geologic pasts"
- This was opposed to the principle of catastrophism which suggests that the earth has been shaped only by violent and catastrophic events.
- From the principle of uniformitarianism, we can deduce that some processes shaping the earth are slow and might not really be perceptible in our limited human lifetime.
- The mountains we see today were once at very elevated positions but today, they have been weathered to their present day level.
Learn more:
Soil erosion brainly.com/question/2473244
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Answer:
drop the question so I can help you
Answer:
options: A, D and E
Explanation:
Back-and-forth movement loosens sediment and rock.
Loose sediment is picked up and blown to other locations.
Sediments scrape against one another and wear away surfaces
I believe those are correct. hope this helps :)
