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8 and 9 review answers
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49
Environmental Studies
9th Grade
03/05/2013

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Term
A fault is ?
Definition
Faults are fractures in Earth where movement has occurred
Term
An earthquake epicenter is ?
Definition
The epicenter is the location on the surface directly above the focus
Term
When an earthquake occurs energy radiates in all directions from its source which is called the ?
Definition
Focus
Term
Earthquakes are usually associated with ?
Definition
Large fractures in earths crust and mantle called faults
Term
What causes earthquakes ?
Definition
Earthquakes occur due to the release of built up energy
Term
Most earthquakes are produced by the rapid release of elastic energy stored in rock subjected to great forces ?
Definition
Elastic energy
Term
During an earthquake the ground surface
Definition
Can move in any direction
Term
The adjustments of materials that follow a major earthquake often generate smaller earthquakes called
Definition
Aftershocks
Term
Major earthquakes are sometimes preceded by smaller earthquakes called
Definition
Foreshocks
Term
The slow continuous movement that occurs along what fault ?
Definition
San Andreas fault
Term
Which seismic waves travel most rapidly ?
Definition
P waves
Term
What is true about p waves ?
Definition
They compress and expand rocks in the direction the waves travel
Term
Overall which seismic waves are the most destructive?
Definition
The surface waves are because surface waves move in an up down side to side motion
Term
What is the minimum number of seismic stations that is needed to determine the location of an earthquakes epicenter ?
Definition
Three
Term
What instrument records earthquake waves?
Definition
seismograph
Term
How much of an increase in wave amplitude is seen from an earthquake measuring 5.4 on the Richter scale compared to one measuring 4.4 ?
Definition
10 times greater
Term
A succession of ocean waves set in motion by a submarine earthquake is called an ?
Definition
Tsunami
Term
In areas where unconsolidated sediments are saturated with water,earthquakes can turn stable soil into fluid through a process called ?
Definition
Liquidfaction
Term
Violent shaking from an earthquake can cause soil and rock on slopes to fail and cause a ?
Definition
Landslide
Term
Why do earthquakes often cause damaging fires ?
Definition
The fires started when gas and electrical lines were cut
Term
Long range earthquake forecast are based on the idea that earthquakes are ?
Definition
Repetitive or cyclical
Term
What layers of earth make up the lithosphere ?
Definition
Crust and uppermost mantle
Term
Through which Earth layer are S waves NOT transmitted ?
Definition
outer core because it is liquid
Term
Earths core is made of an alloy of ?
Definition
iron,nickel
Term
Wegners continental drift hypothesis stated that all continents once joined together to form ?
Definition
A single continent
Term
The supercontinent in the continental drift hypothesis is called ?
Definition
PANGAEA
Term
In the plate tectonics theory the lithosphere is divided into
Definition
plates and plates can be made up of both continental and oceanic lithosphere
Term
A tectonic plate consists of
Definition
crust and uppermost mantle
Term
A divergent boundary at two oceanic plates can result in a ?
Definition
Rift valley
Term
What type of boundary occurs where two plates move together,causing one plate to descend into the mantle beneath the other plate ?
Definition
Convergent boundaries
Term
Give an example of a transform boundary ?
Definition
San Andres fault
Term
What occurs when divergence occurs between two oceanic plates ?
Definition
seafloor spreading
Term
The Himalayas in south asia are an example of what type of plate boundary ?
Definition
Continental-continental
Term
Volcanic island arcs are associated with what type of plate boundary ?
Definition
Oceanic-oceanic
Term
Which of the following affects the amount of destruction caused by earthquake vibrations ?
Definition
The design of the structure,the intensity and duration of the vibrations,the nature of the materials on which structures are built
Term
What hypothesis states that the continents were once joined to form a single continent ?
Definition
Continental drift
Term
One kind of evidence that supports Wegener's hypothesis is that ?
Definition
Fossils of the same organisms have been found on different continents
Term
How did opponents of continental drift account for the existence of similar fossils on widely separated ?
Definition
Migration across land bridges
Term
Which of the following statements correctly describes the asthenosphere ?
Definition
It permits plate motion
Term
In the plate tectonics theory the lithosphere is divided into ?
Definition
7 major plates and many smaller plates
Term
A tectonic plate consists of ?
Definition
crust and uppermost mantle
Term
In the plate tectonic theory a plate can be made up of ?
Definition
both continental and oceanic lithosphere
Term
A divergent boundary at two oceanic plates can result in a ?
Definition
rift valley
Term
What type of boundary occurs where two plates move together causing one plate to descend into the mantle beneath the other plate ?
Definition
Convergent boundary
Term
Which of the following is a geographic example of a transform fault boundary ?
Definition
the san andreas fault
Term
New ocean crust is formed at ?
Definition
divergent boundaries
Term
Which of the following results when divergence occurs between two oceanic plates ?
Definition
seafloor spreading
Term
The Himalayas in South Asia are an example of what type of plate boundary ?
Definition
Convergent continental-continental boundary
Term
Volcanic island arcs are associated with what type of plate boundary ?
Definition
convergent oceanic-oceanic boundary
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