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GEOL 102 Petrology Chapter 2: Rock Classification and Composition

12 Questions

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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?

Rate of cooling Signup and view all the answers

Which factor determines the classification of metamorphic rocks?

% SiO2, Rock Type, Lithology of protolith Signup and view all the answers

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

% Dark-colored minerals Signup and view all the answers

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

Clastic Sedimentary Rock Signup and view all the answers

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

Coquina Signup and view all the answers

What process leads to the formation of Chemical Sedimentary Rocks?

Evaporation of mineralized fluid Signup and view all the answers

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

Metamorphic Rocks Signup and view all the answers

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

Texture and composition Signup and view all the answers

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

Formation process Signup and view all the answers