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!!!
<span>In the mantle, heat is transferred as soft rock flows slowly in cycles known as convection currents. convection currents are the currents that are caused due to the process of convection. It is actually one of the three main process of heat transfer. The other two process of heat transfer are conduction and radiation. </span>
geyser, eruption, and heated ground water because they all describe what this thing is.
Answer:
The impact and mitigation techniques are the following:
Explanation:
1. Earthquake: Earthquake cause severe damage to the building and infrastructure that leads to high deaths of people and losses to property. It can be mitigate by making more strong infrastructure and avoid making building in those region where earthquakes occurs.
2. Landslides: It also cause high damage to the soil as well as to the people by killing them. Vegetative cover and growing of trees on the edges of lands can reduce its frequency.
3. Tsunamis: It causes severe damage to the coastal regions and cause damage to the property as well as to the people. The damages can be reduced by making strong wall in the coastal regions. Vertical evacuation to existing natural high ground, tsunami-resistant structures are also mitigating techniques.
4. Floods: It causes great damages to both property, land and people. It can be reduces by making dams as well as reduce pollution that cause global warming.
5. Droughts: It can reduce the crop productivity of an area. Crop rotation. Contoured row crops, Terracing and Tillage practices are the mitigating techniques used for drought.
