Since scientists began collecting data on earthquakes in the 1960s, what have they realized about tectonic plate boundaries? ? a) they are concentrated at plate boundariesb) they happen at set timesc) they occur at the same placed) they mostly occur at divergent plate boundaries

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?