Question

which best explains why objects fall downward when dropped?
a the center of earth exerts a gravitational pull
b earths orbit exerts a downward force on the atmosphere.
c most objects are heavier than the air in earths atmosphere.
d the force between earths magnetic poles pulls objects downward

Explanation:

The downward fall of dropped objects is caused by Earth's gravitational force, which pulls all objects with mass toward its center. Option B is incorrect because Earth's orbital motion does not create a downward force on objects. Option C is wrong because buoyancy relative to air does not explain the core reason for downward fall (even low-mass objects fall downward). Option D is incorrect as magnetic poles only affect magnetic materials, not all falling objects.

Answer:

A. The center of Earth exerts a gravitational pull