Question

coated with two different materials would generate enough friction to create an electrical charge. so if metal wires are placed on that surface, and water droplets touch them as they move, harvesting electricity should be possible, ma reasoned. \its a very simple idea,\ he says. what must happen to make harvesting electricity possible? complete the sentence with the correct phrases. water droplets must a surface and touch that have been placed soak into move across bounce off

Explanation:

The text states that if metal wires are placed on a surface and water droplets touch them as they move, harvesting electricity is possible. So for the first blank, "move across" is correct as the droplets need to move over the surface. For the second blank, "metal wires" is the correct object that the droplets touch.

Answer:

Water droplets must move across a surface and touch metal wires.