GEOL 102 Petrology Chapter 2: Rock Classification and Composition
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Questions and Answers

Which factor determines the composition of igneous rocks?

  • Size of grain
  • Percentage of SiO2 (correct)
  • Degree of crystallinity
  • Color of the rock

What determines the texture of sedimentary rocks?

  • Lithology of protolith
  • Magma chemistry
  • Size of grain (correct)
  • Degree of Crystallinity

How are sedimentary rocks formed?

  • From the rate of cooling
  • From the deposition and lithification of sediment grains (correct)
  • From the crystallization of molten material
  • From magma chemistry

What is responsible for the degree of crystallinity in igneous rocks?

<p>Rate of cooling (C)</p> Signup and view all the answers

Which factor determines the classification of metamorphic rocks?

<p>% SiO2, Rock Type, Lithology of protolith (A)</p> Signup and view all the answers

What is the primary factor affecting the color of sedimentary rocks?

<p>% Dark-colored minerals (D)</p> Signup and view all the answers

Which type of sedimentary rock is composed of fragments (clasts) of pre-existing minerals and rocks?

<p>Clastic Sedimentary Rock (B)</p> Signup and view all the answers

Which sedimentary rock is classified based on the percent abundance of fragments embedded in a matrix?

<p>Coquina (B)</p> Signup and view all the answers

What process leads to the formation of Chemical Sedimentary Rocks?

<p>Evaporation of mineralized fluid (A)</p> Signup and view all the answers

Which type of rocks are markers for temperature and pressure due to recrystallization from higher temperature and pressure?

<p>Metamorphic Rocks (D)</p> Signup and view all the answers

What is the classification basis for Metamorphic Rocks according to the text?

<p>Texture and composition (C)</p> Signup and view all the answers

What differentiates Clastic Sedimentary Rocks from Biochemical and Chemical Sedimentary Rocks?

<p>Formation process (C)</p> Signup and view all the answers

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