Fact 1: Gravity causes objects that have mass to be pulled down on a planet. Fact 2: Rocks have mass. Given the two facts above, what does gravity cause to be pulled down on a planet?

Choose your answer from:
A). matter.
B). heat.
C). earth.
D). solutes.
E). oceans.
F). Rocks.
G). people.
H). Lift.
Answer:
F).