The line between one tectonic plate and another is.. ..Plate boundary
..Plate Tectonics
..Sea Floor Spreading

Plate boundary.

Explanation:

A divergent plate boundary often forms a mountain chain known as a ridge. This feature forms as magma escapes into the space between the spreading tectonic plates. A transform plate boundary occurs when two plates slide past each other, horizontally.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.