EARTH STUDY (continued) 



Rocks And Soils, Volume 15, Number 3 



Rocks 



Collect different kinds of 

 pebbles at a brook or 

 in the road; which of 

 these are the hardest 

 and will scratch others 



Besides a difference in 

 hardness rocks are 

 "put together" dif- 

 ferently, in layer; 

 which separate solid 

 and uniform and made 

 up of glistening parts 

 collect each 



Soils 



Earth Changes, Volume 15, Number 3 



Erosion, hills and valleys 



Notice how after rains 

 the roofs and high 

 places are washed clean 

 of dust and fine dirt 

 notice the color of 

 brooks following a rain 



Make mud pies of differ 

 ent kinds of soil includ- 

 ing sand; some soils 

 stick together better 

 than others ; appear- 

 ance of gravel and mud 

 walks after a rain 



Crystal study, using salt 

 sugar, blue vitriol; life 

 story of two rock types 

 relation between na- 

 ture of brooks and kind 

 of rocks; minerals as 

 food 



Determine from soil maps 

 the rocks lying under 

 your farm or home 

 garden; need and 

 source of fertilizers 



When stocking your 

 aquarium note how 

 much muddier the 

 water is if you have 

 garden loam instead of 

 sand on bottom; note 

 variety of things in soil 



What animals do you find 

 changing the nature of 

 the soil; how do angle 

 worms for example 

 change it; what kind 

 of plants grow best on 

 certain soils 



Prepare soil for garden 

 and crop projects prop- 

 erly so as to sappiy 

 plants with a ready 

 supply of food and 

 water 



Notice how running 

 water cuts its way 

 through mud and sand 

 or snow and ice; find 

 in the mud, valleys, 

 hills, divides, gorges, 

 and other land and 

 water forms; work of 

 frost 



Why stones have to be 

 picked off hillside 

 farms; find influence of 

 this on the value of the 

 farm and upon the 

 products of the farm- 

 what prevents erosion 



Why not cultivatf 

 straight up and down 

 hillside; study geolog- 

 ical survey maps of 

 school district; plan 

 drainage on farm 

 value of trees on h;ill- 

 side 



Deposition 



Notice how gutters get 

 clogged with waste; 

 slush in the spring 

 should illustrate con- 

 ditions favorable and 

 unfavorable for depo- 

 sition 



Does swift water or 

 - slowly moving water 

 fill in more rapidly; 

 are large particles 

 placed together with 

 small ones; where is 

 soil 'deepest 



Influence of sediment on 

 value of farm lands and 

 products; land forma- 

 tion by sediment; 

 '14-T) "Ooze and 



Slime;" plant and sed- 

 iment relationships 



Plan ponds on your farm 

 which wMl make good 

 fishponds, swimming 

 ponds, <ir watering 

 plarcs 



217 



