Rocks – Notes & Focus


 
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Rocks – Notes & Focus
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Rocks – Notes & Focus Questions

Directions: Get a copy of the Heath Earth Science book and read pages 63 – 67, 69 – 71, and 76 – 79. If you don’t do the readings, the notes and questions will be much more difficult, so don’t skip the readings.
 

bullet Igneous Rocks form from cooled off molten rock, either magma (underground) or lava (at the surface.) The deeper the magma is when it cools off, the more slowly it cools, and the larger the crystals that form. Igneous rocks are classified according to their mineral composition (which we generally use color to give us clues about), whether they are dark colored (mafic), medium colored, or light colored (felsic), and their texture, or crystal size, whether they have large crystals, medium sized crystals, small crystals, or amorphous rocks, with no crystals. They may even be porphyritic rocks, with two or more sizes of crystals.
 
bullet Sedimentary Rocks are classified by the method they were formed. They are either clastics, formed from sediments (bits and pieces of pre-existing rocks), or formed by chemical means, when insoluble substances precipitate (settle) out of mixtures of solutions, that later evaporate, or by organic means, from the remains of plants and animals.
 
bullet Metamorphic Rocks are changed by combinations of heat and pressure, and are classified by the presence of re–crystallization (small crystals become larger) and foliation (the crystals line up in layers or stripes.)
 
bulletDo these Focus Questions
 
Page Questions    
 
68 #3 – 7
74 #9
79 #20 – 21 and 23
   
 
 
 

 
 
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