Exam (elaborations)
ESS 101 B Laboratory 6 Quiz: Metamorphic Rocks
- Course
- ESS 101
- Institution
- University Of Washington
ESS 101 Introduction to Geology | ESS 101 B Laboratory 6 Quiz: Metamorphic Rocks
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3/9/24, 3:15 PM Laboratory 6 : Metamorphic Rocks: ESS 101 B Wi 24: Introduction To Geology And Societal ImpactsLaboratory 6: Metamorphic Rocks
Due Feb 25 at 11:59pm
Points 13
Questions 35
Available Feb 16 at 9am - Feb 25 at 11:59pm
Time Limit None
Allowed Attempts 2
Instructions
Learning Goals
By completing this lab, students will:
Understand the processes that form metamorphic rocks and the environments in which they take
place
Develop a deeper understanding of the rock cycle and the general differences between igneous,
sedimentary, and metamorphic rock properties
Gain familiarity with common minerals that are found in metamorphic rocks, and gain practice
identifying metamorphic rocks
ESS101 Lab 6: Metamorphic rocks
This quiz was locked Feb 25 at 11:59pm.
Attempt History
Attempt Time Score
LATEST Attempt 1 37 minutes 13 out of 13
,3/9/24, 3:15 PM Laboratory 6 : Metamorphic Rocks: ESS 101 B Wi 24: Introduction To Geology And Societal Impacts
Answers will be shown after your last attempt
Score for this attempt: 13 out of 13
Submitted Feb 25 at 6:41pm
This attempt took 37 minutes.
Introduction
Last week we learned about the processes that act to break down rocks at earth’s surface, and we also
explored the lithification processes that turn weathered rock fragments into new sedimentary rocks.
However, this is not the end of the story for geological materials at earth’s surface. We know that earth’s
tectonic plates are constantly rearranging the crust, and this can cause large pressure and temperature
gradients at tectonic boundaries. Rocks in these regions can be subjected to high pressures and/or
temperatures that can rearrange the minerals’ crystal structure. These changes (collectively called
metamorphism) can affect the rock’s mineralogy (chemical composition) and/or its texture or
appearance. Rocks that have undergone these changes are called metamorphic rocks.
Figure 6-1. Metamorphic Temperature and Pressure Conditions. Note that diagenesis refers to changes that
happen at near-surface conditions during the sedimentary lithification process, and it is not considered a metamorphic
process. Additionally, at very high temperatures and pressures, rock will melt into magma and undergo other igneous
processes.
Metamorphism can alter any rock that is subjected to temperatures and pressures that are much greater
than surface conditions but are not high enough for the rock to re-melt into a magma. The pressure and
,3/9/24, 3:15 PM Laboratory 6 : Metamorphic Rocks: ESS 101 B Wi 24: Introduction To Geology And Societal Impacts
temperature conditions that the rock (called a protolith or parent rock) experiences determine how much
change occurs to the rock. Rocks that are altered at lower pressure and temperature conditions are
called low-grade metamorphic rocks; rocks that are altered at very high pressure and temperature
conditions are called high-grade metamorphic rocks. The grade of metamorphism is directly related to
how much change can be observed in the structure of the rock.
Figure 6-2. Metamorphic grade increases as pressure and temperature increase. This figure shows that shale (a
sedimentary protolith) changes form and takes on very different physical properties depending on the pressure and
temperature conditions that it encounters during metamorphism.
Question 1
0..2 pts
Laboratory Honor Statement
Cheating or plagiarism of any kind will not be tolerated in ESS 101. This includes copying answers from
a friend or classmate, copying answers verbatim found on the internet or other literary sources, or
copying any work that may answer the question being asked. Make sure you always use your own words
when answering the questions in the homework and cite appropriate references if you use them to help
you answer the question. Anyone caught violating the academic code of conduct
, 3/9/24, 3:15 PM Laboratory 6 : Metamorphic Rocks: ESS 101 B Wi 24: Introduction To Geology And Societal Impacts
(https://www.washington.edu/cssc/for-students/academic-misconduct/) will receive a “0” grade on the
assignment, and if the conduct is deemed egregious, reported to the UW Academic Misconduct
representative.
I acknowledge that I have carefully read and understand the above statement regarding the
consequences of cheating and plagiarism, and promise to complete my work in this class with honesty
and integrity. Answer "True" below supporting your acknowledgement.
True
False
Question 2
0..2 pts
Which type of metamorphic rock would look most similar to its protolith?
High-grade metamorphic rock
Low-grade metamorphic rock
Question 3
0..2 pts
Using Figure 6-1, match each of these formation conditions to the type of rock that would form.
150C and 150 MPa
sedimentary
500C and 900 MPa
metamorphic
600C and 50 MPa
metamorphic
900C and 500 MPa
Question 4
0..2 pts
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