How do we know the outer layer of the core is molten

But it may surprise you to learn that, in between the solid inner core and the solid mantle, lies a liquid layer more than 2,000 kilometers thick: the Earth's outer core... The way we know that the outer core is liquid is quite brilliant: from the seismic waves produced from earthquakes.

Answerradius is the lateral bone of the forearm when considering the anatomical position, it is wide at its distal, and narrow at its proximal;

ulna forms the elbow joint with humerus at its proximal end with its olecranon process. the ulna is slightly larger than the radius;

ok i looked up raial, and theres no such bone in the human body /// check the spelling/// both of the above bones are in your lower forearm you'll get it good luck/