Which statement best describes the theory of plate tectonics? a) plates sometimes move closer to one another. b) sections of earth that shift are part of earth's asthenosphere. c) sections of earth's continents are in slow, constant movement. d) parts of the ocean floor move as they are carried by rift valleys.

The answer should be C. Sections of Earth's continents are in slow, constant movement.

C) Sections of Earth's continents are in slow, constant movement.  

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a characteristic is a deep cut in the earth or left over rock aka till.  

what events in mexico's history might explain why the country continues to have difficulty improving social justice and economic opportunities for all people?