Fact 1: The mass of a planet causes the pull of gravity on that planet. Fact 2: Gravity is the pulling force that holds objects to the surface of a planet. Given the two facts above, the mass of a planet causes the pulling force that does what?
Available choices:
I. holds objects to its surface.
II. deadly and devastating.
III. a tree falling.
IV. principals of aerodynamics.
V. causes weather.
VI. to move people.
VII. forces air to the surface.
VIII. changes rotations.
I.