Fill in the Blanks Activity 3Online version Completa el texto con base al texto científico by My Project 1 Earth Earth nucleus which structure system mayor lower million layers planet superficial composed Sun solar earth third smaller The volume of the is more than a times than the , is the from the Sun . It is the of the four terrestrial planets of our The of the is of . The most is the bark . The second is the mantle , is divided into the upper and lower mantle , and the last and deepest is the , which is divided into the upper and nucleus .