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Quiz

ESCI 1001 Quiz: ESCI Lab Quiz 6

by OneClass2401166 , Spring 2018
2 Pages
55 Views
Spring 2018

Department
Earth Sciences
Course Code
ESCI 1001
Professor
Edwards
Study Guide
Quiz

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1. What are the four types of products produced by physical and chemical weathering?
a. Lithic (rock) grains, resistant mineral grains, altered mineral grains, dissolved
ions
2. Which of these contribute to detrital (clastic) sedimentary rocks?
a. Lithic, resistance minerals, and altered minerals
3. which one of the four is the primary source material for chemical/biogenic sedimentary
rocks?
a. Dissolved ions
4. Why do geologists use texture to identify and classify detrital sedimentary rocks, but
composition to identify and classify chemical and biogenic sedimentary rocks?
a. Detrital are classified by their grain size because it reflects the amount of energy
it took to transport the grains and the shape can reflect their degree of transport
5. What information does texture provide about the origin of detrital sedimentary rocks?
a. Angular grains in breccia had little movement, conglomerates rounded grains had
long transport. Strong current gravel and pebbles so breccia and conglomerates
form in high energy, mudstones and shale in quiet water, sandstones in
intermediate energy
6. What information does composition provide about the origin of chemical/biogenic rocks?
a. Limestone & dolostone (carbonate rocks) form in shallow open marine, coal in
swamps from compaction of land plant material, rock salt and gypsum form in
arid environments with high evaporation, chert form from many silica-shelled
plankton on deep sea floor
7. How can you tell, even from a distance, that outcrops are composed of sedimentary
rocks based on their larger-scale sedimentary structures?
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Description
1. What are the four types of products produced by physical and chemical weathering? a. Lithic (rock) grains, resistant mineral grains, altered mineral grains, dissolved ions 2. Which of these contribute to detrital (clastic) sedimentary rocks? a. Lithic, resistance minerals, and altered minerals 3. which one of the four is the primary source material for chemical/biogenic sedimentary rocks? a. Dissolved ions 4. Why do geologists use texture to identify and classify detrital sedimentary rocks, but composition to identify and classify chemical and biogenic sedimentary rocks? a. Detrital are classified by their grain size because it reflects the amount of energy it took to transport the grains and the shape can reflect their degree of transport 5. What information does texture provide about the origin of detrital sedimentary rocks? a. Angular grains in breccia had little movement, conglomerates rounded grains had long transport. Strong current gravel and pebbles so breccia and conglomerates form in high energy, mudstones and shale in quiet water, sandstones in intermediate energy 6. What information does composition provide about the origin of chemical/biogenic rocks? a. Limestone & dolostone (carbonate rocks) form in shallow open marine, coal in swamps from compaction of land plant material, rock salt and gypsum form in arid environments with high evaporation, chert form from many silica-shelled plankton on deep sea floor 7. How can you tell, even from a distance, that outcrops are composed of sedimentary rocks based on their larger-scale sedimentary structures? a. All sedimentary rocks have bedding planes which gives the outcrops a distinctive layered appearance that allows you to identify them as being sedimentary even from a distance 8. Which changes more during metamorphism: a rocks texture or its overall chemical composition? a. texture 9. Why can metamorphism of shale yield a whole suite of different metamorphic rocks
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