Answer:
Land is the least effective because most disasters that occur are caused by either air or water...air pollution or flood.
It focuses on the main foreign policy events, such as World War I, the Paris Peace Conference, the establishment of the League of Nations, the Munich Agreement, World War II, the Yalta Conference, the establishment of the United Nations, the Cold War, and the emergence of the European Union.
.......... therefore
<em>The</em><em> </em><em>answer</em><em> </em><em>is</em><em>:</em><em> </em>
B.
Because the orbital period and rotational period are the exact same.
Siberia covers the majority of Russia