ECSI 409: Geology Exam 1 Actual Questions Detailed And Correct Answers Already Graded A+.
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ECSI
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ECSI
Mineral - correct answer Naturally occurring, inorganic, crystalize structure, chemical formula
Isotope - correct answer Unstable element, more neutrons than protons
Ion - correct answer ...
ECSI 409: Geology Exam 1
Mineral - correct answer Naturally occurring, inorganic, crystalize structure,
chemical formula
Isotope - correct answer Unstable element, more neutrons than protons
Ion - correct answer An atom which has lost or gained electrons
Rock - correct answer Cohesive aggregate of one or more minerals
Compound - correct answer Composed of 2 or more separate elements
What are the 2 principle groups of sedimentary rocks? - correct answer Classic
and chemical
What is the 'Principle of Superposition' and how is it used to determine relative ages of rocks? - correct
answer Principle of Superposition: the principle that in series of stratified
sedimentary rocks, the lowest stratum is the oldest
Younger sedimentary rocks are deposited on top of older sedimentary rocks
Describe how a granite might be transformed into a sedimentary rock - correct answer
Granite exposed to the effects of weathering, will erode and be deposited in a still environment such as
the bottom of a lake or sea.
These eroded particles may undergo the process of lithification, whereby the particles are compacted
and cemented together, forming a sedimentary rock
What are the possible sources of the heat or pressure that can cause metamorphism? - correct answer
-Burial under many km of overlying rock. The weight of the overlying rock can put great pressure on the
rocks below.
, -Temps increase within depth of the Earth. Crustal temps can increase @ the rate of 30 degrees celsius
per km
What is foliation? - correct answer Process of being split into thin sheets.
What is plate tectonics? - correct answer Deformation to the existence +
movement of rigid "plates" over a weaker, more plastic layer in the Earth's upper mantle. Also provides
the framework for understanding much about earthquakes and volcanoes.
How are continental drift and seafloor spreading related? - correct answer
Seafloor Spreading: process by which new lithosphere is created at spreading ridges as plates of oceanic
lithosphere more apart
Continental Drift: concept that the continents have moved about over the earth's surface
How is paleomagnetic evidence used to support the theory of plate tectonics? - correct answer
Once every 200,000 years the Earth's magnetic field reverses polarity
Minerals in rocks made during periods of normal polarity will face opposite direction to the minerals
created in periods of reverse polarity (magnetic strips)
Other evidence for the occurrence of plate tectonics: 1 - correct answer -
Continents: the continents are shaped almost as if they are puzzle pieces that fir together nicely, could
they have once been one big piece?
Other evidence : 2 - correct answer -Climate: similar glacial deposits found
around Africa, Antarctic, S. America, etc. suggest they were once all together. Coal deposits found in
Europe/ N. America prove they were once closer to the the equator since coal is developed in tropical
areas
Other evidence: 3 - correct answer -Fossils: specific fossils, like glossopteris,
have been found on different continents that suggest they were once formed together
What are hot spots? - correct answer Areas on the crust that have an unusually
high heat flow
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