In The Hydrosphere, young readers learn the hydrosphere is made up of all the water on Earth.  Water exists in three forms—liquid, solid, and water vapor. Water moves around Earth in the water cycle. Water is necessary for life on Earth, and it is important to keep water clean.
 
Softcover, 8×8 in., 24 pages
Word Count 274,  Lexile Measure 580L
A pronunciation guide is included. Reading Level 1-3, Interest Level 2-5.