People cut down the tropical rainforests and one of the main reason why they do it is so that they can have roads there instead.
Answer:
The age of the rock = 2800.6 million years = 2.8 billion years.
A simple method of analysis similar to Carbon dating is used to obtain the required age of the rock. Radioactive substances decay according to first order reaction kinetics. So, plugging all the required parameters into the general equation for amount of substance left in a first order decay gives us the age of the rock.
Explanation:
Half life of Uranium-235 = 700 million years (from literature)
The decay of radioactive substances follow first order reaction kinetics.
The general equation is given as
A(t) = A₀ e⁻ᵏᵗ
A(t) = Amount of radioactive substance left after a particular time = 6.25%
A₀ = initial amount of radioactive substance = 100%
t = time that has passed since the beginning = age of the rock = ?
k = decay constant
The decay constant is related to the half life (T) through the relation,
k = (In 2)/T
k = (0.693/700) = 0.00099 /million years
A(t) = A₀ e⁻ᵏᵗ
6.25 = 100 e⁻ᵏᵗ
0.0625 = e⁻ᵏᵗ
In e⁻ᵏᵗ = In 0.0625 = -2.7726
-kt = - 2.7726
t = (2.7726/0.00099) = 2800.6 million years
t = 2.8 billion years.
Hope this Helps!!!
Answer:
Explanation:Feudalism protected Western Europe from outside invaders, but it did not bring peace to a region. vassals often placed their personal interestsin the firs place over the interests of the areas they ruled. Feudal lords had complete power in their local areas and could make harsh demands on their vassals and peasants.
- Feudalism helped protect communities from the violence and warfare that broke out after the fall of Rome and the collapse of strong central government in Western Europe.
- Feudalism helped restore trade.
- Feudalism benefited lords, vassals, and peasants. Lords gained a dependable fighting force in their vassals.
- Feudal ceremonies, oaths, and contracts required lords and vassals to be faithful and to carry out their duties to each other.
- Feudalism did not allow one person or organization to become too powerful.
<h2>
bad</h2>
- Because there was no strong central government to enforce laws fairly, it was easy to use force, violence, and lies to get one’s way.
- Lords or vassals often placed their personal interests over the interests of the areas they ruled like i said in first paragraph.
- not treat people equally or let them move up in society.
<u> i think it did both it helped for good,and for bad.</u>
Answer:
its the world's longest unfortified border :))
