grade 8 science - macdonald drive junior high...
TRANSCRIPT
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Grade 8 Science
Unit 1:
Water Systems on Earth
Chapter 2
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Oceans are important...
1. Primary water source for the water cycle
2. Control weather
3. Support diverse life
4. Provides humans with food, minerals, and resources
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The Origin of the Oceans
1. Tectonic Plates
2. Volcanic action
3. Erosion
4. Glaciation
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Tectonic Plates
Has helped determine
where ocean basins are
located.
Tectonic plates move
changing the position of the
continents.
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Panthalassa... Oceans then
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Oceans now
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Volcanic Action
Has built ocean floor along
mid-ocean ridges in areas
where plates separate.
Has helped build continental
divides in areas where plates
have collided and mountain
building occurs.
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Water trapped in volcanic materials were released as vapour. It cooled, condensed and fell back to the earth. This water collected in the lowest parts of the Earth’s surface... The ocean basins.
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Erosion
Has aided the further
development of continental
drainage systems as
material is removed and
deposited into the ocean
basins.
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Glaciation
A force of erosion in the
development of continental
drainage systems.
Glaciers move materials
towards the oceans.
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Hudson Bay
Lowlands,
Ontario
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Researching the Ocean Floor
Technologies include...
1. Sonar
2. Satellites
3. Core sampling
4. Underwater photography/
videography
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5. Deep sea submersibles
6. Diving
Refer to pages 46 - 49
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“UNDERSEA ADVENTURE”
CORE STSE
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Underwater explorations
Shipwrecks
Ex. The Titanic Discovered in
1985
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Technologies: Past & Present
Diving Submersibles
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Wire line
depth probe Sonar
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“GETTING TO KNOW THE OCEAN
FLOOR”
Activity 2-2 page 50-51
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Continental Margin
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Continental shelf:
the submerged part of the
continent between the
coast and the edge of the
basin.
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Continental slope:
continental shelves slope
gradually away from the
land before dropping
drastically.
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Abyssal plain:
Wide, open features of the
sea.
Formed of thick deposits of
sediments.
Where do these sediments
come from?
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Mid-Ocean ridge:
Long, undersea mountain
chains formed from
volcanic eruptions.
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Canadian Organizations
involved in Ocean Research
1. Environment Canada
2. Federal Fisheries
3. Ocean Science Centre
4. Centre for Cold Ocean
Research (C-CORE at MUN)
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Ocean Currents...
A large amount of ocean
water that moves in a
particular and unchanging
direction.
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2 Types of Ocean Currents...
1. Surface currents
Flow in the top 100-200 m
2. Deep currents
Flow below 200 m
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Surface Currents
Factors that influence
surface currents are:
1. Wind
2. Earth rotation
3. Shape of the Earth’s
continents
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Wind
Air movement caused by
uneven heating.
The energy of the moving
air is transferred by friction
to the water molecules
causing it to move.
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Earth Rotation
The Earth spins counter-
clockwise.
This spinning body deflects
winds and currents
depending on what side the
equator they are on.
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This alteration of direction
is called the Coriolis effect.
Clockwise in
the Northern
Hemisphere
and Counter
clockwise in
the Southern
Hemisphere
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Shape of Continent
Moving currents are forced
to turn when they meet a
solid surface.
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Deep Water Currents
The most important
influences are:
1. Water temperature
2. Salinity
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Water Temperature
Not the same at every
depth.
*Cold water
is also more
dense than
warmer
water.
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Salinity
Seawater is less salty at the mouths of large rivers due to the fresh water entering the ocean.
Fresh water also enters where glaciers and icebergs melt and areas of high precipitation.
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High amounts of
evaporation increases
salinity as well as freezing.
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Local Ocean Currents...
1. Labrador Current
cold water
2. Gulf Stream
warm water
Refer to map p. 54
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Waves...
Large ripples set in motion
by steady winds.
Waves on the surface of
water are the result of a
transfer of energy from
moving air to the water.
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Common Wave Features:
*As a wave approaches a shoreline,
the wavelength decreases and the
wave height increases.
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2 Types of Waves:
1. Swells
Smooth waves
caused by
wind and
storms far
out in the
ocean.
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2. Breakers
The tumble
of water
when a wave
collapses
onshore.
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Tsunamis
Giant waves that can be
sent in motion by
earthquakes on the ocean
floor, landslides or volcanic
eruptions near the
shoreline.
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Can be very destructive.
November 18,
1929
South Coast of NL
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Tides...
The slow rise and fall of the
ocean.
The upper and lower edges
of a beach are determined
by the high- and low- tide
mark.
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Tides are connected to the
motion of the moon and
the spinning of the Earth.
The moon exerts a greater
force of pull than the sun
due to its closer proximity
to Earth.
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High Tide
Low Tide
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2 Types of Tides:
1. Spring Tide:
Occur when the Earth,
Sun and Moon are in a
line.
Causes extra high and
low tides.
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2. Neap Tides:
Occur when the Sun and the
Moon are at right angles to
one another.
Causes the smallest tidal
movements. There is little
difference between low and
high tides.
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Tidal Range:
The difference in level
between a high and a low
tide.
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Shaping Our Shorelines...
Waves have the power to erode
and deposit sediments on the
shore.
Tides work with waves to
determine the range of
shoreline that can be affected
by wave action.
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Factors that affect the
interaction of waves and
tides on the shorelines are:
1. Slope of the shoreline
2. Shape of the shoreline
3. Type of rock material
4. Wave energy
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Shoreline Features...
Wave energy is concentrated
on headlands and spreads out
as it reaches bays.
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Sand bar or Shoal
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Shorelines can change quickly
Example...
Intense wave action during:
winter storms
hurricanes
Etc.