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Oceans
Unit Standards
5.E.3B.2
Develop and use models to explain the effect of the
movement of ocean water (including waves, currents,
and tides) on the ocean shore zone (including beaches,
barrier islands, estuaries, and inlets).
5.E.3B.3
Construct scientific arguments to support claims that
human activities (such as conservation efforts or
pollution) affect the land and oceans of Earth.
5.E.3B.4
Define problems caused by natural processes or human
activities and test possible solutions to reduce the impact
on landforms and the ocean shore zone.
Oceans
• Ocean waves
continually roll in
to shore and
then back out to
sea.
• The power of the
pounding waves
changes the
shape of the
coast.
Oceans
• Beach erosion is the
process by which
waves pick up sand
particles and move
them along the
shore.
• Through this
process waves
smooth out the
shoreline or carve
out bays and cliffs.
Oceans
• Many types of rock
break down slowly in
seawater.
• The water contains
carbon dioxide from the
air, and this makes the
water slightly acidic.
• The carbon dioxide
helps dissolve the salt
in the rock.
• The particles that do
not dissolve are carried
away by the waves.
Oceans
• Marine terrace- a
flat step of rock
formed in an
exposed windy
area where the
waves pound hard
against the shore.
• Over time the
waves cut out, or
erode, a steep cliff.
• Marine terraces
are common along
the Pacific Coast.
Oceans
• Beach driftthe pulling of
sand
particles
sideways
along a beach
Oceans
• Breakers- waves that
break into foam
against the shore,
wash back into the
ocean at another
angle.
• This creates a zigzag
movement of sand
down the beach.
• Beach drift can move
sand and pebbles
hundreds of meters
every day.
Oceans
• The movement of
sediment along the
shore depends on
the currents, the
size of the sand
grains, and the
pattern of breaking
waves.
• The amount of
sediment that can
be moved can be
large.