The gravitational attraction between two objects is reduced by a factor of 4 when the separation distance between them is doubled.
According to Newtonian mechanics, the "pull" of gravity is caused by mass. There is only a pull between any two masses and each additional mass. Although the magma itself does not produce gravitational force, the gravitational force is a result of the magma's extreme heat.
The earth is kept in its orbit by the gravitational pull of the sun, which protects it from straying into interstellar space. We are anchored to the surface of the earth by the gravitational pull of the planet.
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