World War 2 occurred in the late 40's, so this is most likely why there is a dip in that age group.
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Earth has earthquakes because of the plate tectonics that move underneath earths surface.
Explanation:
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I can't Understand you Sorry
Answer:
lithosphere
The geosphere is considered to comprise the entire earth solid atmosphere. The earth is also into two parts the interior and the exterior core, the mantle and the crust.
Answer:
Language, age, religion, & race
