Last Updated：2022/12/22
Sentence
The
word
"ash"
is
not
a
very
good
one
to
include
all
the
mechanical
accompaniments
of
a
subaerial
or
subaqueous
eruption,
since
ash
seems
to
be
restricted
to
a
fine
powder,
the
residuum
of
combustion.
A
word
is
wanting
to
express
all
such
accompaniments,
no
matter
what
their
size
or
condition
may
be,
when
they
are
accumulated
in
such
mass
as
to
form
beds
of
"rock."
We
might
call
them
perhaps
"pyroclastic
materials,"
...
Quizzes for review
The word ash
is not a very good one to include all the mechanical accompaniments of a subaerial or subaqueous eruption, since ash seems to be restricted to a fine powder, the residuum of combustion. A word is wanting to express all such accompaniments, no matter what their size or condition may be, when they are accumulated in such mass as to form beds of rock.
We might call them perhaps pyroclastic materials,
...
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English - English
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