A group of curious aliens visits Earth and discovers that: *its surface is 70% water and 30% land *there is a north pole and a south pole *it has seven continents and four oceans *Asia is the largest continent *the Nile, the world's longest river, is in Africa *the ice covering Antarctica is over a mile thick and much more! Here Loreen Leedy explores the planet Earth with young readers as she introdces them to geography.