What causes an ionic bond to form between sodium and chlorine? Sodium and chlorine atoms share electrons.

Sodium and chlorine atoms switch electrons.

Sodium atoms gain electrons.

Sodium atoms donate electrons.

Answer: buoyancy forceexplanation: in simple terms, the principle states that the buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration, g. this is also known as upthrust.

Independent variable is something that is changed in a experiment. 

That would be kinetic energy

Not what goes around on earth but the universe too.