Truman and Stalin we’re both powerful leaders. In 1947, the ‘Truman doctrine’ was announced. This doctrines purpose was: to contain threats in Greece and Turkey, and to counter Soviet geopolitical expansion during the Cold War. This was an act of maintaining peace.
Similarly, Stalin had also created a foreign policy which was commonly referred to as, ‘Stalin’s four point foreign policy’. This policy was declared in 1939, and was used to enforce his ideas of communism and to better the Russian people.
To conclude, both Truman and Stalin used foreign policies to maintain and control peace within their countries.
Answer:
During the 1960's the disclosure of enormous gas and oil fields in Alaska accelerated the change of most coal framework to other petroleum products. During this period Usibelli Coal Mine bought the Suntrana mine and the mining activities in the Matanuska coal fields stopped activity.
Definition of erosion (according to National Geographic): “Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water.”
1. Describe the features that water erosion produces in your images (mountains, canyons, deserts, etc?) What do they have in COMMON?
Mountains: Water erosion would create a waterway around the mountains.
Canyons: Water erosion would create more area between the canyons.
Deserts: Water erosion would generally change the desert’s landscape by making the hills more downslope.
What they have in common: They all create changes to the landscape of different areas.
2. You can see water erosion even when you do not see water. How is this possible? Be clear!
This is possible by rain?
- I’m not exactly sure about this question.
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.
