EOS 170 LECTURE QUESTIONS 1-8 QUESTIONS WITH 100% SOLVED
CORRECT ANSWERS.
The early earth's interior was hotter or colder? - (Correct Answer) - hotter
how do we know the age of the earth? - (Correct Answer) - radiometric dating of meteorites
For natural hazards, what is the term describing the average time between similar events at a
given location? - (Correct Answer) - Return period
Which of the following locations has the higher seismic risk?
-pop 11000
-pop 6000000 - (Correct Answer) - pop 6000000
What type of stress causes strain in form of extension? - (Correct Answer) - tension
... causes strain - (Correct Answer) - stress is caused by strain
What happened during Earth's planetary differentiation? - (Correct Answer) - The Earth melted
and separated into an iron-rich core and silica-rich mantle.
What is the main mechanism for heat transfer between the Sun and the Earth? - (Correct
Answer) - radiation
,What is the difference between continental and oceanic crust in terms of density? - (Correct
Answer) - Oceanic crust has higher density than continental crust.
What is the main mechanism for heat transfer through the deep mantle (the asthenosphere and
mesosphere)? - (Correct Answer) - convection
Which part of the Earth can be described as viscoelastic (behaves as a viscous fluid on long
timescales, but as an elastic solid on short timescales)? - (Correct Answer) - mantle
What are the origins of the Earth's internal energy? - (Correct Answer) - Accretion of material
forming the planet, Differentiation of material within the Earth, Radioactive decay of radioactive
elements within the Earth.
Which of the following natural hazards can be made greater, or more frequent, due to human
activity:
a. Forest fires
b. Hurricanes
c. Flooding
d. All of the above - (Correct Answer) - d
What type of stress causes strain in form of contraction? - (Correct Answer) - compression
hazard= ? x ? - (Correct Answer) - vulnerability x risk
,Which class of meteorites describes undifferentiated planetary material? - (Correct Answer) -
chondrites
Which class of meteorites describes planetary core material? - (Correct Answer) - iron
meteorites
Earthquake drills are an example of: - (Correct Answer) - Preparation
What causes the Earth to have a magnetic field? - (Correct Answer) - flow of the outer core
What is thermal remnant magnetization? - (Correct Answer) - Recording of the Earth's magnetic
field by the mineral magnetite as it crystallizes.
How can the dip angle of the fault influence the magnitude of an earthquake? - (Correct
Answer) - A shallow-dipping fault will slip more than a steeply-dipping fault, generating a larger
magnitude earthquake.
What is the name of the tectonic feature which runs ~1000 km from offshore Vancouver Island
to offshore northern California? - (Correct Answer) - Cascadia subduction zone
What would influence the shaking intensity felt during an earthquake at a given location?
a. The magnitude of the earthquake.
, b. The type of rock in that location.
c. The depth of the earthquake.
d. The distance to the earthquake epicenter.
e. All of these factors would influence the felt intensity. - (Correct Answer) - e
What type of plate boundary does the San Andreas fault represent? - (Correct Answer) - A
continental strike-slip boundary.
What is the driving force of plate tectonics?
. Radioactive decay of U, Th and K within the Earth's crust.
b. Conduction of heat through the lithosphere.
c. Formation of warm, buoyant crust at mid-ocean ridges pushes the plates apart.
d. Pulling of cold, dense ocean slabs into the mantle at subduction zones.
e. Both a & b.
f. Both c & d. - (Correct Answer) - f
What best describes particle motion during the passage of a P-wave? - (Correct Answer) -
Compression/tension in the direction that the P-wave travels.
In which order would the seismic waves from an earthquake arrive at any given seismometer?
a. (1) S-wave, (2) surface wave, (3) P-wave.
b. (1) P-wave, (2) surface wave, (3) S-wave.
CORRECT ANSWERS.
The early earth's interior was hotter or colder? - (Correct Answer) - hotter
how do we know the age of the earth? - (Correct Answer) - radiometric dating of meteorites
For natural hazards, what is the term describing the average time between similar events at a
given location? - (Correct Answer) - Return period
Which of the following locations has the higher seismic risk?
-pop 11000
-pop 6000000 - (Correct Answer) - pop 6000000
What type of stress causes strain in form of extension? - (Correct Answer) - tension
... causes strain - (Correct Answer) - stress is caused by strain
What happened during Earth's planetary differentiation? - (Correct Answer) - The Earth melted
and separated into an iron-rich core and silica-rich mantle.
What is the main mechanism for heat transfer between the Sun and the Earth? - (Correct
Answer) - radiation
,What is the difference between continental and oceanic crust in terms of density? - (Correct
Answer) - Oceanic crust has higher density than continental crust.
What is the main mechanism for heat transfer through the deep mantle (the asthenosphere and
mesosphere)? - (Correct Answer) - convection
Which part of the Earth can be described as viscoelastic (behaves as a viscous fluid on long
timescales, but as an elastic solid on short timescales)? - (Correct Answer) - mantle
What are the origins of the Earth's internal energy? - (Correct Answer) - Accretion of material
forming the planet, Differentiation of material within the Earth, Radioactive decay of radioactive
elements within the Earth.
Which of the following natural hazards can be made greater, or more frequent, due to human
activity:
a. Forest fires
b. Hurricanes
c. Flooding
d. All of the above - (Correct Answer) - d
What type of stress causes strain in form of contraction? - (Correct Answer) - compression
hazard= ? x ? - (Correct Answer) - vulnerability x risk
,Which class of meteorites describes undifferentiated planetary material? - (Correct Answer) -
chondrites
Which class of meteorites describes planetary core material? - (Correct Answer) - iron
meteorites
Earthquake drills are an example of: - (Correct Answer) - Preparation
What causes the Earth to have a magnetic field? - (Correct Answer) - flow of the outer core
What is thermal remnant magnetization? - (Correct Answer) - Recording of the Earth's magnetic
field by the mineral magnetite as it crystallizes.
How can the dip angle of the fault influence the magnitude of an earthquake? - (Correct
Answer) - A shallow-dipping fault will slip more than a steeply-dipping fault, generating a larger
magnitude earthquake.
What is the name of the tectonic feature which runs ~1000 km from offshore Vancouver Island
to offshore northern California? - (Correct Answer) - Cascadia subduction zone
What would influence the shaking intensity felt during an earthquake at a given location?
a. The magnitude of the earthquake.
, b. The type of rock in that location.
c. The depth of the earthquake.
d. The distance to the earthquake epicenter.
e. All of these factors would influence the felt intensity. - (Correct Answer) - e
What type of plate boundary does the San Andreas fault represent? - (Correct Answer) - A
continental strike-slip boundary.
What is the driving force of plate tectonics?
. Radioactive decay of U, Th and K within the Earth's crust.
b. Conduction of heat through the lithosphere.
c. Formation of warm, buoyant crust at mid-ocean ridges pushes the plates apart.
d. Pulling of cold, dense ocean slabs into the mantle at subduction zones.
e. Both a & b.
f. Both c & d. - (Correct Answer) - f
What best describes particle motion during the passage of a P-wave? - (Correct Answer) -
Compression/tension in the direction that the P-wave travels.
In which order would the seismic waves from an earthquake arrive at any given seismometer?
a. (1) S-wave, (2) surface wave, (3) P-wave.
b. (1) P-wave, (2) surface wave, (3) S-wave.
