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Earth's Dynamic Crust Flashcards | StudBud
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Earth's Dynamic Crust
Earth's Dynamic Crust
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Answers
1
Which letter is the epicenter?
B
C
A
2
What is the relationship between P wave travel time and distance to epicenter?
there is no relationship
as time increases epicenter decreases
as time increases epicenter increases
S waves travel faster
3
Which part of earth's interior has convection currents?
asthenosphere
inner core
rigid mantle
inner core
4
Why would P waves be received at a station but not S waves?
S waves do not travel through solids
S waves do not like the heat
P waves are easier to detect
S waves do not travel through liquids
5
Where is the Ring of Fire located?
around the Atlantic Ocean
Hawaii
Antarctica
Around the Pacific Ocean
6
The East Pacific Ridge is the boundary between what 2 plates?
Pacific & Antarctic
Pacific & North American
Eurasian and African
Nazca and South American
7
What is the approximate depth to Earth's center?
5500 km
1200 Km
6400 km
12700 km
8
Which is NOT evidence of continental drift?
seismic wave behavior
matching fossils
sea floor spreading
continents fit like puzzle pieces
9
As evidence accumulates, the support for the theory that the continents were once joined
decreases
remains the same
increases
10
Antarctica's location and climate changed because Antarctica moved
northward resulting in a colder climate
northward resulting in a warmer climate
southward resulting in a warmer climate
southward resulting in a colder climate
11
What provides evidence of the pattern of crustal movement?
the rate at which the continents are moving
how many volcanoes erupt per hour
the locations of deep and shallow focus earthquakes
how fast the s waves travel
12
What is the best evidence that sea floor spreading is occurring at the mid Atlantic ridge?
bedrock is younger near the ridge
the ridge is the location of irregular volcanoes
the bedrock of the seafloor is igneous rock
several faults cut the sea floor
13
What is the Ring of Fire?
the only place you will find volcanoes
A zone of seismic activity
ring around the Atlantic Ocean
a ring of lava
14
A seismic station is 2000km from the epicenter. What is P wave travel time?
4 min
10 min
7 min
2 min
15
What type of boundaries are associated with reversed magnetism?
hot spot
divergent
transform
convergent
16
What movement is happening along the San Andreas fault?
sea floor spreading
subduction
transform movement
divergence
17
What is the difference in time between a P and S wave if the city is 3000km from the epicenter?
6 minutes 50 seconds
4 minutes 40 seconds
8 minutes 20 seconds
3 minutes 0 seconds
18
An earthquake occurred at 3:41. What time did the P waves arrive 4000 km away?
3:42
3:48
4:00
4:41
19
Fossils are found in South America. What other continent are they likely to be found?
Europe
North America
Africa
Antarctica
20
How many stations do you need to find an earthquakes epicenter?
2
3
4
1
21
A huge ocean wave produced by an undersea earthquake is called
volcano
hurricane
tornado
tsunami
22
Which letter is the focus?
B
C
A
23
What kind of boundary do you find at the Mariana trench?
convergent
transform
divergent
hot spot
24
What is the average velocity of an earthquakes P wave in it's first 7 minutes of travel?
1360 km/min
571 km/min
2000 km/min
258 km/min
25
The main difference between magma and lava is
viscosity
temperature
composition
location
26
Which layer of earth has a pressure of 1.0 million atmospheres?
outer core
mantle
inner core
crust
27
On the Richter scale, what is the difference between a 2 and a 5?
10
100
1
1000
28
How much does the Richter scale go up by?
5 times
1 time
100 times
10 times
29
The Pacific plate is subducting under the
Antarctic plate
North American plate
Nazca plate
Indian Australian plate
30
Compared to other layers of earth, the inner core is
most dense
coldest
least dense
highest
31
What percentage of Earth's surface are covered by oceans?
70%
40%
25%
99%
32
The inferred latitude of NYS 359 million years ago was closest to the
north pole
Antarctica
prime meridian
equator
33
Most inferences about the characteristics of Earth's mantle and core are based on
moon rocks
scientists opinions
volcanic activity
seismic wave behavior
34
If there is a 3 minute difference between p and S wave travel time, find distance to epicenter.
2800km
1800km
3800km
1000km
35
What causes plate movement?
earthquakes
mountain formation
conduction through rocks
convection
36
Which events are most closely associated with volcanoes?
hurricanes
earthquakes
tornadoes
sandstorms
37
The epicenter is closest to
Pittsburgh
New York City
New Orleans
Louisville
38
What is an area where magma breaks through the crust that is not on a plate boundary?
boundary
plume
convergent
hot spot
39
Why does the oceanic crust sink below the continental crust?
it is more dense
it's random
it is less dense
40
Where do most earthquakes occur?
they are equally distributed over the Earth
they are concentrated along plate boundaries
they only occur on the equator
they occur on the continents
41
What is the temperature at the mantle core boundary?
500
8000
5000
3000
