#1
Mount
St.
Helens
is an
active
stratovolcano
located
in
Skamania
County
,
Washington
, in
the
Pacific
Northwest
region
of
the
United
States
.
#2
It is 96
miles
(154
km)
south
of
Seattle
and 53
miles
(85
km)
northeast
of
Portland,
Oregon
.
#12
Mount
St.
Helens takes
its
English
name
from
the
British
diplomat
Lord St
Helens
,
a
friend
of
explorer
George
Vancouver
who made
a
survey of the
area
in the
late
18th
century.
#3
The mountain
is
located in
the
Cascade
Range
and is part
of
the
Cascade
Volcanic
Arc
, a segment
of
the
Pacific Ring
of
Fire
that
includes
over
160
active
volcanoes
.
#10
This volcano
is
well known for
its
ash
explosions
and
pyroclastic
flows
.
#4
Mount
St.
Helens is most
famous for
its
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