Exam (elaborations)
APSC 151 MIDTERM QUESTIONS AND ANSWERS
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APSC 151 MIDTERM QUESTIONS AND ANSWERS
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Name: Score:21 Multiple choice questions
Term 1 of 21
The seismic shadow zone revealed by seismic P-and S-waves is evidence of:
the low-velocity zone
the MOHO boundary
the liquid nature of the inner core
the inner core--outer core boundary
the core-mantle boundary
Term 2 of 21
The half-life for the decary of carbon-14 is closest to:
500 years
5,000 years
50,000 years
500,000 years
5,000,000 years
Term 3 of 21
In an attempt to model the composition of the deep layers in the interior of the Earth, we try to
re-create conditions deep in the Earth's interior using:
a diamond anvil press
the mineral composition of metamorphic rocks
a seismometer
a smelting furnace
the inverse-theory approach
,Term 4 of 21
You are at Queen's University in Kingston, Ontario. With a brilliant new drilling apparatus that
you have invented, you are able to drill a hole straight down (i.e., vertically) through solid rock
until you reach, and pass through, the Mohorovivic Discontinuity (i.e., the Moho). From the drill
hole, you are able to obtain a sample of the material from just below the Moho. What is the
composition of that sample.
iron
felsic
ultramafic
intermediate
mafic
Term 5 of 21
The Earth is flattened at the poles, with a [pole-to-pole/equator-to-equator] ration of
[299/300], because:
the Earth is a rotating body
the moment of inertia of the earth is variable
the continents are concentrated in equatorial regions
the earth's axis is tilted at about twenty-three degrees to the plan of the solar system
the moon exerts a tidal force on the earth
, Term 6 of 21
You are in the middle of the Pacific Ocean on a ship equipped to drill holes straight down into
solid rock at the bottom of the sea. You are trying to drill such a hole down to the Mohorovivic
Discontinuity. How far will you have to drill from the sea bottom in order to reach the Moho?:
2 km
5 km
10 km
30 km
100 km
Term 7 of 21
Tectonic plates move:
directly over the asthenosphere
directly over the lithosphere
directly over the liquid outer core
directly over the Moho
between the crest and the lithosphere
Term 8 of 21
By weight, 90% of the earth is made up of four elements. These four, in decreasing order of
abundance from left to right, are:
Si, O, Al, Fe
O, Fe, Si, Ni
O, Si, Al, Fe
Fe, O, Si, Mg
O, Si, Fe, Al
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