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4-WE SAVE NATURAL RESOURCES-N.S-6TH

 

4-1-WHAT ARE THE SPHERES OF THE EARTH?

 pag.66-67




4-2-HOW DOES THE EARTH'S SURFACE CHANGE?

 pag.68-69




4-3-WHAT ARE ROCKS?

 pag.70-71




4-4-WHAT ARE MINERALS?

 pag.72-73




4-5-WHAT ARE ROCKS AND MINERALS USED FOR?

 pag.74-75




4-6-OUR ROCKS AND MINERALS' FAIR (INDEX CARDS)

 pag.76




4-7-BUY LESS, BUY BETTER

 pag.79