Question

Why does the Earth exert a gravitational force on objects on its surface?

A. It has an atmosphere,
B. It has mass
C. It has a magnetic field.
D. It is so dense.

Answer 1

B. It has mass

Step-by-step explanation:

The Newtons Universal gravitacion law is : F = G.
`(m1 m2)/(d^(2) )` , where F is the force exerted , m1 and m2 are the earth's mass and the object's mass, d is the distance and G the gravitacional constant. Comparing to the options we can say that the Earth exerts a gravitational force on objects on its surface because of its mass.