Scientists have tracked the changes in this land for many years. Picture A shows how the land looked to start with. Many years later, the land looked like picture B. What most likely caused the change in the land?

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.

C) the periods  of day and night would be fixed all year for anyone at the  equator