17) Ferdinand von Zeppelin invented what flying machine? a) Zepplin
b) B Flyer
c) Rocket
d) Space Shuttle

Which of the following lists correctly orders the earth's layers from its innermost layer to its outermost layer? a. mantle, inner core, outer core, crust b. crust, inner core, outer core, mantle c. crust, mantle, outer core, inner core d. inner core, outer core, mantle, crust