The answer is: Younger
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Answer:
Crust: the outermost layer of Earth
Mantle: located between the core and the crust; region of hot, slow-flowing solid rock
Convection: the movement of matter that results from differences in density caused by variations in temperature
Core: extends from below the mantle to the center of the Earth
Lithosphere: the outermost, rigid layer of Earth
Asthenosphere: the layer of weak or soft mantle that is made of rock that flows slowly; tectonic plates move on top of this layer
Mesosphere: the strong, lower part of the mantle
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Uneven distribution of wealth, increased population leads to crowded urban areas which could be unsanitary, immigration can cause cultural conflicts