Why don’t the present shapes of the continents fit perfectly in to a supercontinent

Which changes of state do the labels represent? a: b: c:

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct

What is the coefficient of kinetic friction μk between the block and the tabletop?