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Vocabulary Chapter 1: Lesson 2
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Seismic waves
Pressure
Crust
Basalt
Granite
Mantle
Lithosphere
Asthenosphere
Outer core
Inner core
Seismic wave
oWhat
an
earthquake
produces
pressure
o
o
A mass of rock
pressing on an area
EX. The deeper
down the greater
the pressure
Crust

The layer of rock
that forms Earth’s
outer skin; both dry
land and ocean
floor
Basalt
o
A dark fine
grained rock that
makes up the
ocean floor
•
Granite
A rock that is usually a
light in color and has
coarse grains which is
the most amount of
rock that makes up
the continental crust
Mantle
•
A layer of hot rock
that is divided into
layers and nearly
3000 km. thick
lithosphere
•
The crust and the
uppermost part of
the mantle that is
brittle rock.
•
asthenosphere
The soft hot layer
under the mantle that
is under more pressure
that is less rigid than
the lithosphere but still
solid
Outer core
•
Layer of molten
metal surrounding
the inner core
which is liquid
Inner core
•
A dense ball of
solid metal (iron
and nickel)