Convection currents occur in the MANTLE. The mantle is the second layer of the earth after the crust. The mantle is approximately 2900 km thick. Convection currents are triggered or fueled by the heat from the Earth's core.
The part of the mantle closest to the core gets heated. It then becomes less dense than the layers above so it rises. When this rising plume interacts with the crust it cools and becomes more dense than the layers below and so it sinks and this circular motion continues to form convection currents.
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B. In the twentieth century alone, the world population grew by more than 5 billion people.
C. Population grew slowly until the eighteenth century because death rates were higher.
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Answer: Combats social exclusion and discrimination. Promotes scientific and technological progress.
Answer:
the Korean War began in 1950 when North Korean communist Army came into the 38th parallel and invaded non-communist South Korea.
Explanation:
so the main reason that this war happened was because of the spread of Communism during the Cold War and Japanese Occupation of Korea during World War II
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