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Running head: EARTH SCIENCES
PSC1515-2686 (June 2020)
Assignment 2 (to turn in by July 7th)
Textbook: Physical Science, by Bill W. Tillery, 10th Edition.
Answer the following questions at your best:
Chapter 19 – Building Earth’s surface
1. What is the principle of uniformity? What are the underlying assumptions of this
The principle of uniformity suggests that in the past, the earth’s geologic processes acted in
intensity similarly, to how they perform at present. Primarily, this principle suggests that this
uniformity accounts for all geological alterations and that the principle is significant to
geological thinking and triggers the development of geological science
2. What does the presence of folded sedimentary rock layers mean about the geologic
history of an area?
The presence of folded sedimentary rocks signifies that the rocks were in the past exposed to
compressive stress. Due to this, a plastic strain may have caused the layers of rock to form into
3. Describe the conditions that would lead to faulting as opposed to folding of rock layers.
Faults can occur in response to various forces that enclose compression, shear and tension.
The type of fault that occurs however depends on the kind of exerted force on the rock layers.
4. How would plate tectonics explain the occurrence of normal faulting?
A fault occurs because of the brittleness of the earth’s response to stress. Primarily, the
tectonic plate movement offers the pressure resulting in the rocks at the earth’s surface to break.
Faults do not have a definite length scale (Tillery, 2002). They can range from few to thousands
of kilometers in length.
5. What is an earthquake? What produces an earthquake?
An earthquake is the trembling of the earth’s facade that may result from a sudden release of
energy within the earth’s lithosphere that produces seismic waves. A sudden slip on a fault causes
When stresses on the edges of the fault o...