2.
Tributary
stream
just
downslope
from
rockfall
deposit
(Photo
C).
(a)
The
large
sedimentary
grains
that
can
be
seen
in
the
stream
channel
are
generally
less
than~1.5
m
in
diameter.
Judging
from
the
turbulence
of
the
mountain
stream,
what
grain
sizes
do
you
expect
to
be
carried
(suspended)
in
the
water?
I
expect
grain
sizes
such
as
sand
and
silt
to
be
carried
in
the
water.
(b)
What
grain
sizes
do
you
expect
to
be
rolling,
sliding,
or
resting
on
the
bottom
of
the
channel,
including
those
that
you
can
see?
I
expect
gravel
to
be
rolling,
sliding,
or
resting
on
the
bottom
of
the
channel.
(c)
How
would
you
describe
the
shape
of
the
sedimentary
grains
you
can
see
in
or
near
this
stream
channel
(Fig.
6168)?
I
would
describe
the
shape
of
sedimentary
grains
to
be
subangular.
3.
River
deposits
exposed
in
the
eroded
bank
of
the
Merced
River
(Photo
D).
(a)
List
all
of the
grain
sizes
that
you
see
or
that
are
likely
to
be
present
in
the
Merced
River
bank
shown
in
photo
D.
The
likely
grain
sizes
present
in
the
rockfall
shown
in
photo
D
are
sand
and
silt.
(b)
How
would
you
describe
the
sorting
of
sedimentary
grains
in
the
stream
bank?
The
sorting
of
sedimentary
grains
in
the
stream
bank
can
be
described
as
poorly
sorted.
(c)
How
would
you
describe
the
shape
of
sedimentary
grains
you
can
see
in
the
stream
bank?
The
shape
of
sedimentary
grains
in
the
stream
bank
can
be
described
as
subround.
(d)
If
the
sediments
in
the
stream
bank were
lithified,
what
kind
of
sedimentary
rock
would
they
form?
If
the
sediments
in
the
stream
bank
were
lithified,
they
would
form
a
conglomerate.
(e)
How
would
you
describe
the
change
or
evolution
of
sediments
between
the
tributary
streams
and
the
main
Merced
River?
The
change
of
sediments
between
the
tributary
stream
and
the
Merced
River
can
be
described
as
the
sediments
became
rounder
and
smaller
over
time.
4.
Use
your
observations
to
make
predictions.
The
Merced
River
flows
from
Yosemite
Valley
at
an
elevation
of
-1,200
m
above
sea
level
in
central
Yosemite
Valley
to
an
elevation
of
250 m
(¢
