sentences: a moon is a kind of celestial object / body & earth is a kind of celestial object & the earth has more mass than the moon ->  earth as a celestial object has more mass than the moon as a celestial object  earth as a celestial object has more mass than the moon as a celestial object & as the mass of a celestial object decreases , the surface gravity of that celestial object weakens ->  the surface gravity on moon is less than the surface gravity on earth  gravity is a kind of force & surface gravity is a kind of gravity ->  surface gravity is a kind of force of gravity  the surface gravity on moon is less than the surface gravity on earth & surface gravity is a kind of force of gravity ->  the force of gravity on the moon is less than the force of gravity on earth  the force of gravity on the moon is less than the force of gravity on earth & as the force of gravity on an animal decreases , the animal can jump higher generally ->  animals can jump higher on the moon than on earth because the force of gravity on the moon is less than the force of gravity on earth  animals can jump higher on the moon than on earth because the force of gravity on the moon is less than the force of gravity on earth & a human is a kind of animal -> humans can jump higher on the moon becasue the force of gravity on the moon is less than on earth