Hi !!
I would answer ► 2, 3, 4
<em>II- Folk culture from once isolated regions can be diffused to other regions of the world.</em>
<em>III- Pop culture threatens to eradicate folk culture as groups abandon traditions in favor of a common culture.</em>
<em>IV- So folk culture have les and less influence than ever before.</em>
<em />
<em>Which is not so in countries less "developed" industrial countries where traditions are still very important. Of course, they do not have modern communication, but their traditions aren't disappearing.</em>
<em />
<em>I, II and </em> <em>IV are available ... otherwise, that's what I would have said !!</em>
<em>or I and just IV .....</em>
<em />
hope this is correct and helpful ☺☺☺
<u>Evidence of a large glacial lake northeastern Ontario:</u>
The evidences of a large glacial lake in northeastern Ontario are, sand ridges of Rome, relief forms in the plain around the lake in Ontario, the structure of the soil and the glacial remains.
This large glacial lake was named Iroquois which existed approximately 13000 years ago and is said to be enlargement of today's Ontario lake. This was formed because the St Lawrence river was blocked by an ice sheet and it drained towards the south east.
Answer:
Two stars (a and b) can have the same luminosity, but different surface area and temperature if the following condition is met:
(T_a^4)(R_a^2) = (T_b^4)(R_b^2)
Explanation:
The luminosity of a star is the total energy that produces in one second. It depends on the size of the star and its surface temperature.
L = σ(T^4)(4πR^2)
L is the luminosity f the star, T is the temperature of the surface of the star and R is its radius.
Two stars can have the same luminosity if the relation between the radius and the surface temperature is maintained.
To see this lets suposed you have 2 stars, a and b, and the luminosities of each one of them:
L_a = σ(T_a^4)(4πR_a^2)
L_b = σ(T_b^4)(4πR_b^2)
you can assume that L_a and L_b are equal:
σ(T_a^4)(4πR_a^2) = σ(T_b^4)(4πR_b^2)
Now, you can cancel the constants:
(T_a^4)(R_a^2) = (T_b^4)(R_b^2)
as long as this relation between a and b is true, then the luminosity can be the same.
