The Sixth Grade science curriculum consists of 4 units coordinated with each quarter. 
    Unit 1 Quarter 1:  Water on Earth. 
    Unit 2, Quarter 2:   Inside the Restless Earth
    Unit 3 Quarter 3: Weather and Climate
    Unit 4: Quarter 4: Astronomy
The textbook is Holt Reinhard and Winston: go.hrw.com  KEYWORD (see text for keyword for chapters.