Two lightweight metal spheres are suspended near each other from insulating threads. one sphere has a net charge; the other sphere has no net charge. the spheres will:

a. attract each other
b. exert no electrostatic force on each other
c. repel each other
d. do any of these things depending on the sign of the charge on the one sphere

In an experiment, the non-charged balloon moves towards the charged rod. this is applicable with the spheres.
Suppose the sphere is positively charged, the neutrally charged sphere becomes is negatively charged. The positively charged sphere causes the other sphere to be polarized, with negative charge on the side closest to the first sphere. Now the second sphere moves towards the first sphere. answer is A.

Magma  is composed of molten rock and is  stored  in the earth's crust. lava is  magma  that reaches the surface of our planet through a volcano vent.