The mass of a planet causes the pull of gravity on that planet.
Gravity is the pulling force that holds objects to the surface of a planet.
The mass of a planet causes the pulling force that holds objects to its surface.
The mass of a planet causes the pulling force that does what?

(1) holds objects to its surface
(2) deadly and devastating
(3) a tree falling
(4) principals of aerodynamics
(5) causes weather
(6) to move people
(7) forces air to the surface
(8) changes rotations