42 THINKING ABOUT WHAT WE LEARNED
Now we can name some of the reasons why
GREEN TREASURES grow where they do. We know why they grow better in some places than in others. Plants grow better in some kinds of soil. Each kind of food plant needs a certain climate in order to ripen. Plants also need the right amount of moisture to grow well.
If farmers raise the best crops possible,
they must protect their soils. They must keep them from washing away, from blowing away, and from wearing out.