Geol 109 Exam2- Questions & ANSWERS 100%
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Which of the following tectonic processes are thought to have occurred on Mercury?
(Check all that apply) - ✔✔-thrust faulting due to contraction of the planet
-graben formation due to extension
Both extensional and contractional tectonics have occurred on Mercury. Extension
produces graben while contraction produces thrust faults. It is important to remember
extension cannot produce thrust faults nor contractions produce grabens.
Mercury's smooth plains ____________________. - ✔✔may be similar in origin to
the lunar maria
The smooth plains have few craters compared to the heavily cratered terrain and
resemble the lunar maria.
One of these impact craters is on the Moon and the other is on Mercury. Click on the
one on Mercury. - ✔✔A
Crater A has secondary impacts close to the rim, while B has secondary craters farther
from the crater.
What explains for Mercury's iron large core? Choose the two most likely. - ✔✔-
Mercury formed near the Sun in a zone that was oxygen-poor and rich in metallic iron.
-A large impact stripped away the silicate shell from an already differentiated Mercury.
,There are two main theories as to why Mercury has such a large iron core. The first is,
Mercury accreted in an oxygen-poor area that allowed iron to remain in its metallic
state allowing close to all of the iron to segregate in the core.
The second hypothesis is a giant impact knocked off much of Mercury's mantle without
affecting the core, so now the core is large compared to Mercury's diameter.
Lesson 17 - Mars: The Red Planet - ✔✔...
Although both Mercury and Mars have similar gravity fields, Mars has an atmosphere
whereas Mercury does not. What is a possible explanation? - ✔✔Mars is more
volatile rich.
Because Mars accreted further from the Sun than Mercury, Mars has a greater amount
of volatiles. These volatiles were outgassed and released past the surface of Mars where
they were trapped by the gravity field of Mars.
Which planetary body has (basically) no magnetic field today? - ✔✔Mars
Though Mars is larger than Mercury it does not have a present magnetic field. There is
evidence within martian rocks that show there was one in the past, but there is not an
active one today.
Which of the following are important differences between the nature of the martian
hemispheres (north and south)? (Mark all that apply) - ✔✔-ages
-number of young volcanoes and volcanic plains
-elevations
-the number of impact craters
, The northern and southern hemispheres are very different in almost every aspect.
Including ages, crater density, volcanic activity, and elevations.
What is the evidence for ground ice (or ground water) on Mars? Choose all correct
answers. - ✔✔-fluidized crater-ejecta patterns
-chaotic (collapse) terrains
Evidence of water on Mars is seen in impact features produced by melted water and the
chaotic terrain produced by flowing water.
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click on the VALLES MARINERIS. - ✔✔blue, looks like scratches
or a big scar
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click anywhere in the CRATERED HIGHLANDS. - ✔✔all the
yellow, cratered part
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click anywhere in the YOUNGEST PLAINS. - ✔✔on top, blue,
smooth, uncratered
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click on the volcanoes of the THARSIS BULGE. - ✔✔looks like a
pyramid with one big volcano at top and three on bottom
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click on a THICK SHEET OF ICE. - ✔✔red part at the bottom
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Which of the following tectonic processes are thought to have occurred on Mercury?
(Check all that apply) - ✔✔-thrust faulting due to contraction of the planet
-graben formation due to extension
Both extensional and contractional tectonics have occurred on Mercury. Extension
produces graben while contraction produces thrust faults. It is important to remember
extension cannot produce thrust faults nor contractions produce grabens.
Mercury's smooth plains ____________________. - ✔✔may be similar in origin to
the lunar maria
The smooth plains have few craters compared to the heavily cratered terrain and
resemble the lunar maria.
One of these impact craters is on the Moon and the other is on Mercury. Click on the
one on Mercury. - ✔✔A
Crater A has secondary impacts close to the rim, while B has secondary craters farther
from the crater.
What explains for Mercury's iron large core? Choose the two most likely. - ✔✔-
Mercury formed near the Sun in a zone that was oxygen-poor and rich in metallic iron.
-A large impact stripped away the silicate shell from an already differentiated Mercury.
,There are two main theories as to why Mercury has such a large iron core. The first is,
Mercury accreted in an oxygen-poor area that allowed iron to remain in its metallic
state allowing close to all of the iron to segregate in the core.
The second hypothesis is a giant impact knocked off much of Mercury's mantle without
affecting the core, so now the core is large compared to Mercury's diameter.
Lesson 17 - Mars: The Red Planet - ✔✔...
Although both Mercury and Mars have similar gravity fields, Mars has an atmosphere
whereas Mercury does not. What is a possible explanation? - ✔✔Mars is more
volatile rich.
Because Mars accreted further from the Sun than Mercury, Mars has a greater amount
of volatiles. These volatiles were outgassed and released past the surface of Mars where
they were trapped by the gravity field of Mars.
Which planetary body has (basically) no magnetic field today? - ✔✔Mars
Though Mars is larger than Mercury it does not have a present magnetic field. There is
evidence within martian rocks that show there was one in the past, but there is not an
active one today.
Which of the following are important differences between the nature of the martian
hemispheres (north and south)? (Mark all that apply) - ✔✔-ages
-number of young volcanoes and volcanic plains
-elevations
-the number of impact craters
, The northern and southern hemispheres are very different in almost every aspect.
Including ages, crater density, volcanic activity, and elevations.
What is the evidence for ground ice (or ground water) on Mars? Choose all correct
answers. - ✔✔-fluidized crater-ejecta patterns
-chaotic (collapse) terrains
Evidence of water on Mars is seen in impact features produced by melted water and the
chaotic terrain produced by flowing water.
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click on the VALLES MARINERIS. - ✔✔blue, looks like scratches
or a big scar
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click anywhere in the CRATERED HIGHLANDS. - ✔✔all the
yellow, cratered part
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click anywhere in the YOUNGEST PLAINS. - ✔✔on top, blue,
smooth, uncratered
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click on the volcanoes of the THARSIS BULGE. - ✔✔looks like a
pyramid with one big volcano at top and three on bottom
This is a colored topographic map of Mars, with high elevations in brown and white and
low elevations in blue. Click on a THICK SHEET OF ICE. - ✔✔red part at the bottom
