最終更新日:2022/12/24
When sandstone is coarse-grained, it is usually called grit. If the grains are rounded, and large enough to be called pebbles, it becomes a conglomerate, or pudding-stone, which may consist of pieces of one or of many different kinds of rock. A conglomerate, therefore, is simply gravel bound together by a cement.
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元となった例文
When
sandstone
is
coarse-grained,
it
is
usually
called
grit.
If
the
grains
are
rounded,
and
large
enough
to
be
called
pebbles,
it
becomes
a
conglomerate,
or
pudding-stone,
which
may
consist
of
pieces
of
one
or
of
many
different
kinds
of
rock.
A
conglomerate,
therefore,
is
simply
gravel
bound
together
by
a
cement.