83 



2. Unstratified Rock no'de up of layers. 



(a) Granite. 



(b) Trap. 



IV. Making of Rock. 



1. Igneous Rocks formed /i fusion. 



(a) Holocrystalline ccs- grained; granite. 



(b) Cry tocrystalline gained; obsidian. 



2. Sedimentary Rock. 



(a) Deposition from s\ion. 



(1) Stalactites oulagmites in caves. 



(2) Calcareous a. 



(b) Mechanical agenof water. 



(1) Fragmentaick parts of older rocks. 



(2) Shales, sis, sandstone and conglomerates. 



(c) Organic remain 



(1) Limeston^corals, shells, crinoids, and foraminifera. 

 j ) SiliciouHeposits plants diatoms; animals radio- 



^ larian sponges. 



(d) Making of 4 beds. 



o) Dope, o f leaves, stems, and remains of plants. 



^'a 2?^h an d death of sphagnum moss, 

 li'eat^ains of animals, 

 fensedf of streams. 



J^ill a gr> Abrasion of stream bed and banks, 

 end *^) Transportation of material in suspension and solution. 

 ihfffl D e P os ition of detritus. Depends upon volume and velo- 

 , . / city of stream. 



^T) Work of heat. 



(1) Expansion and contraction from change of temperatupe. 



(2) Formation of rock by fusion, 

 (g) Cementing of rocks by 



(1) Carbonate of lime; limestone, clay and sandstone. 



(2) Iron; sandstone. 



(3) Silica; sandstone, 

 (h) Metamorphosis. 



(1) Change in texture limestone to marble. 



(2) Rearrangement of material granite to gneiss. 



PHYSICS. 



WATER. 



(a) Properties liquid, clear, colorless, transparent, tasteless, 

 odorless, cannot be compressed into smaller space, presses 

 in all directions equally. 



