THJ^J WORK OF JfOOrS 111 



colored by earth colors (obtainable at a paint store) 

 and placed over one another and then compressed or 

 moulded so as to form folds like those of rock (syn- 

 clines and anticlines), and placed in the upper sec- 

 tion, we shall be able to see clearly how the water 

 wears its way down through different layers of rock 

 (the layers may be made of different hardness by mix- 

 ing in' more or less sand so as to imitate harder and 

 softer rock layers). In the second section we shall see 

 landslides,^ terraces, meanders, oxbows, bubbling 

 springs (where an obstacle occurs), and all the other 

 features of stream action. In the third section we shall 

 see alluvial fans and cones, deltas, beaches, the deposit 

 of coarse materials near shore, and of finer materials 

 further out and all the features of lake and ocean for- 

 mations. Now that we have learned something of the 

 nature of the soil, let us investigate further the manner 

 in which it retains the soil -water. 



What becomes of the rain water which falls on the 

 soil ? Fill a box about eighteen inches square and four 

 inches deep with sand. On the surface of this place 

 a layer of wet clay; smooth it carefully so as to leave 

 no cracks and bring it down over the outside edges of 

 the box so as to completely cover the sand. Place a 

 quart of water in an ordinary garden sprinkler and 

 slowly sprinkle it on the surface of the clay. Collect 



iln regard to all these features, consult any of the standard elementary 

 text-books of Physical Geograpliy. 



