The molten Earth separated into layers by density in a process known as crust formation true or false?

It would be great if you could take a screenshot of an article or something that says so
(not g o o g l e)

Ben (55kg) is standing on very slippery ice when junior (25kg) bumps into him. junior was moving at a speed of 8 m/s before the collision and ben and junior embrace after the collision. find the speed of ben and junior as they move across the ice after the collision. give the answer in m/s. describe the work you did to get the answer.