Which category would sawdust be in

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Can someone me with questions 15 to 17 plz.