Children's Encyclopedia

adult Aerotrain Africa Arctic areas armor atomic battle bigger birds body bomb bones brain breathe build built butterfly called carried cells cities coal colored crankshaft creatures crops cylinder deep desert dinosaurs earth eggs Egyptian plover electricity enemies engine feet fish flower forests galaxy gear Greeks ground grow heat hovercraft huge hunted insects inside jungle kinds knights land leaves light live look Louis Bleriot machine mammals miles millions Montgolfier brothers moon Mount Everest mountains move muscles nerves nest numbers oxygen picture piston plane pollen Prairie falcon railways rain reptiles river road rock Sahara Desert sailing sea anemone sea scorpions seeds shell ships shows skin South America South Pole space spacemen speed spider stars steam locomotives stone sun's sunlight surface tiny tractors trees turn wheels wind Wright brothers young