Plowing the contour of the land to have minimal soil erosion
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Answer: The most common energy resources from sedimentary rocks are :
Explanation: Sedimentary rocks are formed by the sediments collected over many past years and they provide major resources of energy such as :
- Coal-It is a most common type of sedimentary rock obtained by the accumulation of the organic materials over the past many years .
- Natural gas- It is the gas that is obtained from the sedimentary rock named as shale and it is processed to obtain gas by chemical transformation method
- Oil- It is also a resource obtained by the chemical processing of the organic components and other materials
Answer:
Option C. 2 half lives.
Explanation:
The following data were obtained from the question:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
Half-life is defined as the time taken for the substance to reduce to half its original side. Mathematically, it can be obtained as follow:
N = 1/2ⁿ × N₀
N is the amount remaining.
n is the number of half-lives.
N₀ is the original amount.
Using the above formula, we can obtain the number of half-lives as follow:
Original amount (N₀) = 1000 atoms
Amount remaining (N) = 250 atoms
Number of half-lives (n) =?
N = 1/2ⁿ × N₀
250 = 1/2ⁿ × 1000
Cross multiply
250 × 2ⁿ = 1000
Divide both side by 250
2ⁿ = 1000/250
2ⁿ = 4
Express 4 in index form
2ⁿ = 2²
n = 2
Therefore, it will take two (2) half lives for the amount to get to 250 atoms.
Because that’s where Rocky Mountains are located and that’s where the most copper in the USA can be found. All the mines are located in the same region because there’s the most copper and people can get it there.
Did you mean wave(s)?
If so, p and s waves should be your answer.
Hope this helps!
