How would you change the Flowing Lava Model to make it more like the actual geologic process on Earth?

Answer (d) the universe had cooled enough for atoms to combine, protons and neutrons were too far apart to form nuclei;

The answer is 4f======since electrostatic force is given by    we let f be the electrostatic force when  r = 1 m    if we let  denote the electrostatic force when the distance is decreased so that r = 0.5m, then    we established earlier that f = kq₁q₂. therefore    the force will now be 4f.