by Walker, Colin,

[ 01. English Non Fiction ] Series: Science understandings Published by : Scholastic Canada, (Richmond Hill, Ont. :) Physical details: 22 p. : col. ill. ; 26 cm. Subject(s): Earth sciences. | Rocks. | Hydrology. | Sciences de la terre. | Roches. | Hydrologie. Year : 1992 Item type : 01. English Non Fiction