30 terms

Chapter:22

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The velocity of a seismic wave depends on
the type of meterial it travels through
The fastest seismic wave is a
primary wave
Secondary waves can travel through all areas of the Earth expept the
outer core
An Earthquake occurs as
A and B
The Mohorovicic discountinuity marks the change in rock density elasticity betwen the
mantle and the crustal surface
Evidence to support the fact that Earth's central core is solid can be attributed to
an increase in P-wave velocity as they encounter and move through the inner core
The Earth's magnetic field is attributed to the
flow of molten fluid in Earth's outer core
The upper mentle can be divided into two zones, the
asthenoshere in the lower upper mentle and part of the lithosphere in the upper part of the upper mantle
The lithosphere rides on the top of the asthenosphere. Lithosphere movement causes
Earthquakes, volcanic activity, and mountain building activity
The Mohorvicic discontinuity was discovered by observing
seismograms of a recent Earthquake
The outer core
flows fast enough to power the Earth's magnetic field
The inner core is solid because
pressure from the weight of the surrounding layers prevents the inner coe from melting
The Earth's magnetic field is generated in
the outer core
Thermal convection movement in the upper, mentle
greatly influences the Earth's surface features
The Earth's lithosphere
consists of the crust and the uppermost part of the mantle
Alfred Wegener supported his theory of continental drift by
making a connection between the rocks, rock structures, and plant and animal fossils found in both Africa and South America
The theory of seafloor spreading is supported by
paleomagnetic analysis of the ocean's floor
The rate of seafloor spreading can by calculated by
Knowing the various dates for the magnetic pole reversals, and the distance from the location of a known reversal site to the ocean floor
The ocean crust
becomes progressively older away from the mid-ocean ridges
In the 1950's a plot of the position of the magnetic north pole through time revealed that
either the magnetic poles had migrated through time or the continents had moved
Transform faults ae areas of crustal
accommodation and plate movement
Most of the Earth's seismic activity, volcaanism, and mountain building occur along
plate boundaries
Divergent boundaries are areas of
crustal formation
The ocurrence of Earthquakes in the absence of seafloor spreading, oceanic trenches, or volcanic activity is a characteristic feature of
transform fault boundaries between plates
In a folded sequence of rocks we find older rocks at the axis of the fold and younger rocks always from the fold axis The fold
is called an anticline
Each step of 1 on the Richter sale corresponds to a change in energy release of
30
The stress that occirs when material is pulled apart is called
tensional stress
When rock is subjected to compressive force, it may faulf, If rocks in the hanging wall are pushed up over rocks in the foolwall, it is called a
reverse fault
The San Andreas faulf is a
transform fault
Granite does not readily form near oceanic-oceanic convergent boundaries because
all the above