Answer:
Which 2 are commonwealths
Explanation:
Hawaii is a state and the Virgin Islands and Guam have no major government ruling them, meaning that Puerto Rico and the Marina Islands are commonwealths
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:
Yes, the length of plate widening started from the poles and extends towards the other poles
Explanation:
- As the aspects of spherical geometry, the relative plate motion is affected by the rotation of the earth on its axis and not all are located at the geographic poles. As an example of mid-oceanic ridges that have a spreading value of 37-40 mm/year in southern Atlantic.
- Hene rotation of the poles can be determined by the accuracy an orientation of the mid-Atlantic ridges. Another example is of the African plate is moving to the east and the northern plate is moving to the west as template rotation is anticlockwise and paleomagnetism pole is and evident to this phenomenon.
- Spreading and splitting of the supercontinent like Pangaea created a major displacement in the orient rock and thus led by the rotation of the earth, this phenomenon also called the Euler pole and rotation angle based on the earth's orbit around the sun.
Pilot wind on top !
westerlies in the middle
And trade winds on the bottom
