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Earth's Layer 2

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 1. 
The outermost, rigid layer of the Earth is called the
a.
mesosphere.
c.
asthenosphere.
b.
lithosphere.
d.
outer core.
 

 2. 
Which layer of the Earth is made up of tectonic plates?
a.
core
c.
asthenosphere
b.
mesosphere
d.
lithosphere
 

 3. 
Earth's oceanic crust is ____ than the continental crust.
a.
thinner but denser
c.
thicker but less dense
b.
thicker and denser
d.
thinner and less dense
 

 4. 
The thinnest part of a tectonic plate lies beneath
a.
the middle of the ocean.
c.
the center of a continent.
b.
a mountain range.
d.
a coastal plain.
 

 5. 
The thickest part of a tectonic plate lies below
a.
the middle of the ocean.
c.
the center of a continent.
b.
a mountain range.
d.
a coastal plain.
 

 6. 
The part of the Earth on which the tectonic plates are able to move is the
a.
lithosphere.
c.
mesosphere.
b.
asthenosphere.
d.
subduction zone.
 

 7. 
Which of the following makes up most of the Earth's mass?
a.
crust
c.
outer core
b.
mantle
d.
inner core
 

 8. 
This is a boundary between the crust and the mantle.  Seismic waves change speeds as they pass through this area.
a.
the asthenosphere
c.
the lithosphere
b.
the mohorovicic discontinuity
d.
the seismic boundry
 

 9. 
Scientists have used drilling equipment to drill a hole down into the Earth’s
a.
mantle
c.
crust
b.
aesthenosphere
d.
moho
 

 10. 
The scientific name for the crust is the
a.
aesthenosphere
c.
mantle
b.
lithosphere
d.
continental crust
 

 11. 
This is one of the five elements that make up 90 percent of the Earth’s crust, but the mantle contains more than the crust does.  The amount of this element increases as we go deeper into the Earth.
a.
oxygen
c.
iron
b.
silicon
d.
calcium
 

 12. 
Which type of crust is made mostly of basalt?
a.
oceanic crust
c.
aesthenospheric crust
b.
continental crust
 



 
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