You use a negatively charged PVC pipe to charge an initially neutral metal sphere by induction. When you remove the negatively charged PVC pipe, the metal sphere will be
charged

Positive
Negative
Neutral

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods