SCIN 136 Midterm Exam Answers

SCIN 136 Midterm Exam Answers

Question 1

Early voyagers used a variety of observations to help guide them including:

A.their sense of smell

B.cloud formations

C.the appearance of more birds

D.the direction of waves

E.all of the above

Question 2

The scientific theory about the formation of the oceans is that they first formed from (the original source of the water):

A.magma displacements. B.comet impacts C.degassing of the early Earth D.all of the above

E.both b and c

Question 3

Besides the Navy the primary organizations who carry out “classified” A.the U.N.

B.Green Peace

C.Sierra Club D.oil companies. E.Boeing

F.the banking industry

Question 4
One use today of the Navy’s SOSUS System is to monitor________ to prevent loss of life.
A.dumping of waste in the oceans
1 of 20 B.tsunamis
C.fish populations
D.oil drilling
E.tidal cycles

SCIN-136 Mid-Term Exam

B.tsunamis

C.fish populations

D.oil drilling

E.tidal cycles

F.surfing championships

Question 5
The two types of technology that are mostly used to monitor deep-water oil drilling and to locate and recover
deep shipwrecks are:
A.AUV’s and compasses
B.ROV’s and Side-scan sonar
C.GPS and radar
D.Chronometers and sextants
E.B.P. stock price forecasts and FEMA bureaucrats.

Question 6
The reason that ancient sailors had trouble calculating their LONGITUDE is that they did not have reliable
A.sextants
B.astrolabes
C.clocks
D.compasses
E.all of the above
Feedback: Remember the Forum 1-B questions about John Harrison.
Question 7
Our Sun is but one of billions of stars in the ________ galaxy.
A.Andromeda
B.Milky Way
C.Almond Joy
D.Nebular
E.Ursa Major

Question 8

Earth is approximately how old? A.2500 years

B.120 million years

2 of 20 C.4.6 billion years D.8.4 billion years E.10 billion years

F.It is a tie with Larry King.

B.120 million years

C.4.6 billion years

D.8.4 billion years

E.10 billion years

F.It is a tie with Larry King.

Question 9

The determination of the age of rocks by studying the decay of isotopes is called:
A.carbon-14 dating
B.relative dating
C.radiometric dating
D.absolute dating
E.internet dating
F.Facebook dating

Question 10
The boundaries or eras of geologic time units were first set by noting:
A.which rock units were found on top of others
B.the appearance and disappearance of fossils
C.changes in the predominant color of the rocks
D.the location of major faults
E.the variable location of the water table
F.They just asked Larry King.

Might human remains become index fossils at some point? Something to think about. Extinction isn’t nice but in the Earth’s history it’s normal.

Question 11
This is another term for Greenwich Mean Time. Think also of the military version.
A.ZULU time
B.standard time
C.Universal Time Coordinated (UTC)

D.all of the above

3 of 20 E.a and c above 10/11/14, 4:54 PM

SCIN-136 Mid-Term Exam

C.Universal Time Coordinated (UTC)

D.all of the above

E.a and c above

Question 12

Earth rotates ______ degrees of longitude each hour. Thus this is roughly equal to one time zone.

A.10

B.12

C.15

D.30

E.60

Question 13

Which is the largest of the oceans?

A.The Atlantic

B.The Southern

C.The Indian

D.The Pacific

E.the Arctic

Question 14

The largest region of the Earth in terms of its volume is the:

A.crust

B.mantle

C.outer core

D.inner core

E.lithosphere

F.the current Federal deficeit

Question 15

The reason the continents stick up higher than the ocean basins is that: A.continents are basalt, ocean floors are quartzite

B.continents are granite, ocean floors are serpentine C.the mantle pushes harder under continents

4 of 20 D.continents drain water, ocean floor rock absorbs it E.continents are granite, ocean floors are basalt F.the core bulges under continents

B.continents are granite, ocean floors are serpentine

C.the mantle pushes harder under continents

D.continents drain water, ocean floor rock absorbs it

E.continents are granite, ocean floors are basalt

F.the core bulges under continents

Question 16

The Theory of Plate Tectonics was first proposed by:

A.Issac Hayes

B.Francis Bacon

C.Alfred Wegener

D.Frank Taylor

E.Edward Suess

F.It was created by CNN on a slow news day.

Question 17

About 250 million years ago there was a single landmass we call:

A.Laurasia

B.Panthalassa

C.Pangea

D.Gondwanaland

E.Tethys

Question 18

At various times in the Earth’s history, North America has been part of which “supercontinent”?

A.La-La Land/Oz

B.Laurasia

C.Gondwanaland

D.Pangea

E.a and c

F.b and d

G.a, b, and c

Question 19
Among the evidence Wegener used to support his ideas was:
A.similar old mountain ranges on different continents
B.similar fossils older than 150 million years on different continents
C.the fit of continental coastlines
5 of 20 D.all of the above
E.b and c only

F.he’d seen it on a Fox News panel discussion.

C.the fit of continental coastlines

D.all of the above

E.b and c only

F.he’d seen it on a Fox News panel discussion.

Question 20

The MAJOR force or mechanism driving plate movements would be:___________________. Thus an
earthquake can occur anywhere on Earth.
A.convection cells in the mantle
B.tidal forces pulling on ocean water
C.rotational forces
D.gravitational forces acting at trenches and ridges due to crustal rock densities
E.a and c

Question 21

The site down INSIDE the Earth where an earthquake/seismic event begins is called the:
A.Epicenter
B.Mantle
C.Outer Core
D.Focus

Question 22

Spreading rates for plates are on the order of:

A.1 – 10 mm/yr

B.1 – 20 cm/yr

C.1 – 10 km/yr

D.20 – 30 cm/yr

E.40 – 50 mm/yr

Question 23

Besides paleomagnetism one of the largest sets of “proof” for plate tectonics are: A.distribution of fossils
B.radioactivity in surface rocks C.world-wide tidal cycles D.variance of water depths E.all of the above

Question 24

Japan, the Marinas, Gilbert and other areas near the deep sea trenchs are called:

Japan, the Marinas, Gilbert and other areas near the deep sea trenchs are called:
A.mid-ocean ridge systems
B.tablemounts
C.spreading zones
D.rift valeys
E.island arcs

Question 25

The scientific justification for burying radioactive waste in the trenches is that:
A.the water is already radioactive
B.the waste will be carried back into the radioactive mantle by plate movement
C.cold sea water neutralizes radioactivity
D.it is cheap and easy
E.it will help deep sea fish glow in the dark
F.all of the above

Question 26

The life span of a hot spot is thought to be about __________ years.

A.100,000
B.1 million
C.20 million
D.200 million
E.1 billion

Question 27

A good example of a hot spot is:
A.Hawaii
B.Iceland
C.Yellowstone
D.Tahiti
E.a

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