Landforms and Oceans Presentation
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Transcript of Landforms and Oceans Presentation
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LANDFORMS AND LANDFORMS AND OCEANSOCEANS
Science Standard 5-3Science Standard 5-3The student will demonstrate an The student will demonstrate an
understanding of features, understanding of features, processes, and changes in Earth's processes, and changes in Earth's
land and oceans. land and oceans.
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5-3.1 Explain how natural 5-3.1 Explain how natural
processes (including weathering, processes (including weathering,
erosion, deposition, landslides, erosion, deposition, landslides,
volcanic eruptions, earthquakes, volcanic eruptions, earthquakes,
and floods) affect Earth's oceans and floods) affect Earth's oceans
and land in constructive and and land in constructive and
destructive ways.destructive ways.
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What are constructive
forces?
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Constructive forces are processes that create or build up
landforms.
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What are destructive
forces?
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Destructive forces are processes that
destroy or wear down landforms.
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What are some
examples of
landforms?
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pinker.wjh.harvard.edu/.../Grand%20Canyon.htm
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gsbwww.uchicago.edu/.../porcupines.html
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media.vacationeasttennessee.org/pfoutdoorattr...
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Two ForcesTwo Forces• Constructive:
Building up an existing landform or forming a new one
•Destructive: Changing or destroying an existing landform.
This building is being CONSTRUCTED. This building is being DESTRUCTED.
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What are natural processes?
How do they affect land and oceans?
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WeatheringWeathering
This is a destructive force and
can be chemical or physical. It
causes the surface of the earth
to dissolve, decompose, and
break into smaller pieces.
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WeatheringWeathering• Weathering: A slow, destructive
process that breaks rocks into smaller pieces called sediment.
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ErosionErosion
This is a destructive force. It is
the movement of sediments
and soil by wind, water, and
gravity.
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ErosionErosion
• The movement of materials away from one place.
• Erosion is destructive.
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ErosionTune: "Jingle Bells"
Running down a hillOr coming down as snow,
Water causes muchErosion, this we know.
Wave action moves the beach.A river carves the land.
Everywhere that water goes,It Carries dirt or sand.
Chorus:
Oh, wind and rain, snow and ice,
Water running free;These all cause land to erode
With changes we can see.Wind and rain, snow and ice,
Water running free;These all cause land to erode
With changes we can see .
Wind blowing in a gale,Or as gentle as a breeze,
Wears the rock away,And carries sand with ease.
A hurricane last year,And glaciers long ago,
Are ways that natural forces use
To change the earth we know. (Repeat Chorus)
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DepositionDeposition
This is a constructive force. It
builds up new land by dropping
or depositing sediments via
water, wind, or ice.
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LandslideLandslide
This is a destructive force. This
is a mass movement of land
due to gravity. Landslides even
occur in the ocean on the
continental slope.
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LandslideLandslide
Landslides
can cause
buildings to
fall, or power
and gas lines
to break.
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Volcanic EruptionVolcanic Eruption
This is a constructive force. During
an eruption, melted rock rises
from deep within the earth and
reaches the surface. They can
also occur under the oceans.
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Volcanic EruptionVolcanic Eruption
Seamounts are
volcanoes
that are built
up under the
ocean.
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EarthquakeEarthquake
This is a destructive force.
Earthquakes are vibrations or a
shaking of the ground caused
by energy that is released from
the Earth’s crust.
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EarthquakeEarthquake
Earthquakes under the ocean
can cause huge waves
(tsunamis) that cause great
damage if they come ashore.
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FloodFlood
This is both a destructive force and a
constructive force. Floods occur
when a large amount of water
covers land that is normally dry.
Rapid erosion can take place, but
new sediment is left behind when
the water recedes.
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5-3.2 Illustrate the geologic 5-3.2 Illustrate the geologic
landforms of the ocean floor: landforms of the ocean floor:
*continental shelf *continental shelf
*continental slope *continental slope
*mid-ocean ridge *mid-ocean ridge
*rift zone *rift zone
*trench *trench
*ocean basin *ocean basin
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Journey to Bottom of the Journey to Bottom of the OceanOcean
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We will begin our journey where land meets the ocean.
Do you know where we are?
Yes. At the beach.
Beaches are the fastest changing part of the ocean. They change with every wave.
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Continental ShelfContinental Shelf• The continental shelf is where the edge of the
continent slopes down from the shore into the ocean. • It is the part of the continent located under water. • It is not the deepest part
of the ocean.
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Continental SlopeContinental Slope• The continental slope is a steep drop-off
at the edge of the shelf.
• It drops to the bottom of the ocean floor, making the water much deeper.
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Mid-Ocean RidgesMid-Ocean Ridges• A mountain range on the ocean floor.
• Some of these mountains are volcanic.
• Volcanic mountains that ARE NOT found on the mid-ocean ridges are called seamounts.
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For more information on the ridges, visit http://www.waterencyclopedia.com/Mi-Oc/Mid-Ocean-Ridges.html
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Rift ZoneRift Zone• In the center of the highest part of the mid-
ocean ridge is a narrow trench called a rift.
• Underwater volcanic activity that adds mountains to either side of the mid-ocean ridge occurs at the rift zone.
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Ocean TrenchOcean Trench• The ocean trench is a steep sided canyon or
deep narrow valley in the bottom of the ocean. • Trenches are the deepest part of the ocean
basin and deeper than any valley found on land.
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Ocean BasinOcean Basin• The ocean basin is located on either side
of the mid-ocean ridge.
• It is made up of low hills and flat plains.
• The flat area of the basin is called the abyssal plains.
• This is where seamounts are generally formed.
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Seamount Seamount
• These are volcanic mountains not formed on the mid-ocean ridge.
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5-3.3 Compare continental and 5-3.3 Compare continental and
oceanic landforms. oceanic landforms.
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Earth is made of solid land. Earth is made of solid land.
Some of the land is located Some of the land is located
above Earth’s water and some above Earth’s water and some
is located below the oceans.is located below the oceans.
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Explain how landforms above Explain how landforms above
the oceansthe oceans are similar to are similar to
those found below the oceans.those found below the oceans.
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Continental Landform
Oceanic Landform
Canyon Trench
Valley Rift
Volcano Seamount
Mountain range Mid-ocean ridge
Low hills or plainsOcean basin and
abyssal plain
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5-3.4 Explain how waves, 5-3.4 Explain how waves,
currents, tides, and storms affect currents, tides, and storms affect
the geologic features of the the geologic features of the
ocean shore zone (including ocean shore zone (including
beaches, barrier islands, beaches, barrier islands,
estuaries, and inlets). estuaries, and inlets).
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BeachesBeaches
http://www.virtualtourist.com/travel/North_America/United_States_of_America/South_Carolina/Charleston-864816/Things_To_Do-Charleston-Beaches-BR-1.html
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The shoreline, or coast, is the
area where the land meets the
ocean. Some shorelines are
rocky. Shorelines made of sand
are called beaches. Shorelines
are always changing because of
wind and water.
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Waves can wear away the land and expose a rocky shore or the
waves can deposit sand along the shore and form a beach. If the waves reach the beach at an
angle, the sand is moved along the coast.
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Currents, called longshore currents, along the shoreline can move sand from one location to
another.
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Tides can bring in sand, shells, and ocean sediments at high tide and leave them behind when the
tide goes out.
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Barrier IslandsBarrier Islands
www.dnr.sc.gov/.../river/stewardship_gallery.htm
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Islands are pieces of land surrounded by water on all sides. Islands with sandy beaches are
called barrier islands.
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These barrier islands are naturally occurring and function to protect the mainland from the effects of
waves on its shore. As the waves deposit sand on the beaches, the
shapes of the barrier islands change.
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Currents can move the sand from
one end of the island to the other.
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EstuariesEstuaries
serc.carleton.edu/.../northinlet/index.html
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All rivers flow into the oceans. The area where a river meets the
ocean is known as an estuary. Estuaries have a mixture of freshwater and saltwater.
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Waves can deposit sand in the estuaries. At high tide ocean
water brings in sediments and sea life that feed and nourish life
in the estuary.
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InletsInlets
www.ncsu.edu/.../sc/hunting2/hunting2.html
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Inlets are the water-filled spaces between the barrier islands.
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As the tides change, the amount of water in the inlet will change.
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Ocean currents and storms can change the shape of an inlet
opening.
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Large storms, for example hurricanes, can also cause massive destruction to the
shape of the beaches, barrier islands, estuaries, and inlets because they produce high waves and heavy winds.
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5-3.5 Compare the 5-3.5 Compare the
movement of water by waves, movement of water by waves,
currents, and tides. currents, and tides.
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Volcanoes And EarthquakesVolcanoes And Earthquakes
This map shows how volcanoes and earthquakes occur along tectonic plate boundaries.http://www.pbs.org/wgbh/nova/teachers/activities/2515_vesuvius.html
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http://www.mos.org/oceans/planet/features.html
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ResourcesResources
Magic School Bus Blows Its Top, The. Scholastic. 1995.unitedstreaming. 13 September 2006<http://www.unitedstreaming.com/> (23:56)
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