The body system seen here protects internal structures, provides support, and allows for movement. but this system does not work alone. in order for humans to move, this system must work together with the system.

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convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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