Benchmark 4G
The Physical Setting: Forces of Nature
Grades 9-12, page 96

Gravitational force is an attraction between masses. The strength of the force is proportional to the masses and weakens rapidly with increasing distance between them.

NSES Content Standard B  
Physical Science: Motions and forces 
Grades 9-12, page 180 
Gravitation is a universal force that each mass exerts on any other mass. The strength of the gravitational attractive force between two masses is proportional to the masses and inversely proportional to the square of the distance between them.