unit 5 the ocean resources unit 5 the ocean resources
TRANSCRIPT
Unit 5
The Ocean ResourcesThe Ocean ResourcesThe Ocean ResourcesThe Ocean Resources
Unit 5 The ocean resources
How important are the oceans as a source of food?
How important are the oceans as a source of food?
The marine ecosystemThe marine ecosystem -- Oceans are rich in marine life with different living things range in size.
Phytoplankton (Tiny plants)
Zooplankton (small fish and animals)
Fish and marine animals
Larger marine creatures
Food
Food
Food
FoodFood
All of them become part of the food web in the ocean.
Unit 5 The ocean resources
Food web in the oceanFood web in the oceanUnit 5 The ocean resources
Phytoplankton
Zooplankton
Sunlight
Less Sunlight
No Sunlight
Sunlight
FishSeaweed Shar
k Dolphin
Baleen whaleSquid Sperm whale
OctopusSediments from
land
Crab
1 000 m
200 m
5 000 m
Shell fish
Anglerfish
Eel
How important are the oceans as a source of food?
How important are the oceans as a source of food?
Fish as a source of food
The world’s catch of ocean fish is about 100 million tonnes a year.
The most productive regions are the temperate and sub-tropical continental shelves of the northern hemisphere.
Unit 5 The ocean resources
How important are the oceans as a source of food?
How important are the oceans as a source of food?
Fish as a source of food
Less valuable fish caught are turned into animal feed and fertilizer.
Seaweeds are obtained from the sea. They are used as food for humans and animals or made into fertilizer.
Unit 5 The ocean resources
The world’s important fishing groundThe world’s important fishing groundUnit 5 The ocean resources
Arctic Ocean
Pacific Ocean
Indian Ocean
Atlantic Ocean
Fishing grounds
Asia
Australasia
Africa
North America
South America
km
° N
° N
° S
Europe
N
°
How important are the oceans as a source of food?
How important are the oceans as a source of food?
Fishing industry in HKFishing industry in HK
Most of the marine fish caught are from the shallow continental shelf of the South China Sea.
Fishing industry in HKFishing industry in HK
Most of the marine fish caught are from the shallow continental shelf of the South China Sea.
Unit 5 The ocean resources
How important are the oceans as a source of food?
How important are the oceans as a source of food?
Fish caught by local fishing fleet
Fish imported
Thousand Tonnes
Fis
h
Year
Fish consumed in Hong Kong Recently, the catch by local fishing fleet has declined.
Over-fishing and the pollution of the seas around Hong Kong are the reasons.
Recently, the catch by local fishing fleet has declined.
Over-fishing and the pollution of the seas around Hong Kong are the reasons.
Unit 5 The ocean resources
Are oceans rich in mineral resources?Are oceans rich in mineral resources?Unit 5 The ocean resources
Mining vessel
Diamond miningGold mining
Storehouse of minerals
Mixed with coastal sand and gravel are ores containing tin, gold, platinum, diamond and other gemstones eroded from land.
Are oceans rich in mineral resources?Are oceans rich in mineral resources?Storehouse of minerals
From oceans we can extract a great variety of elements such as magnesium, bromine and copper.
Unit 5 The ocean resources
Copper
Copper Basin
Are oceans rich in mineral resources?Are oceans rich in mineral resources?Storehouse of minerals
The sand and gravel in the sea are very useful building materials.
Salt that we all take each day comes from the sea.
Unit 5 The ocean resources
Sand Lake
Sand
Salt
Are oceans rich in mineral resources?Are oceans rich in mineral resources?
A source of fresh water
In arid regions , desalination plants are built along the coast to purify sea water.
Unit 5 The ocean resources
Are oceans rich in mineral resources?Are oceans rich in mineral resources?A source of fresh water
The fresh water produced is used for drinking, irrigation and industry.
Unit 5 The ocean resources
Desalination plants
Can we obtain energy from our oceans?Can we obtain energy from our oceans?Beneath the sea lie rich oil and gas. Modern technology has made off-shore drilling of oil and gas possible.
Example: the South China Sea are regions rich in oil and gas.
Beneath the sea lie rich oil and gas. Modern technology has made off-shore drilling of oil and gas possible.
Example: the South China Sea are regions rich in oil and gas.
Unit 5 The ocean resources
Distribution of off-shore oil basinsDistribution of off-shore oil basinsUnit 5 The ocean resources
kmOff-shore oil
°N
° N
° S
N
°
Asia
Europe
Africa
North America
South America
Australasia
Arctic Ocean
Pacific Ocean
Indian Ocean
Atlantic Ocean
Can we obtain energy from our oceans?Can we obtain energy from our oceans?Unit 5 The ocean resources
They are coal seams which extend from land outwards to the continental shelf.
Coal
There are layers of coal lying beneath the sea.
Can we obtain energy from our oceans?Can we obtain energy from our oceans?Unit 5 The ocean resources
Coal mining
Coals are hydrocarbon compounds which give out a large amount of heat when burned, which is good for generation of electricity.
Transporting coal
Can we obtain energy from our oceans?Can we obtain energy from our oceans?
Tidal power
It is now possible to harness
tides and waves for the
generation of electricity.
They are renewable energy
which are inexhaustible and do
not pollute the environment.
Tides and waves are our future
source of energy.
Unit 5 The ocean resources
English Channel
France
Britain
N
Case: The River Rance Tidal Power SchemeCase: The River Rance Tidal Power SchemeUnit 5 The ocean resources
Location of the Location of the scheme:scheme:At the estuary of River Rance in Brittany, northwest of France. River flows into the English Channel.
Difference Difference between high between high and low tides:and low tides:
8.5 m
Dam Dam
Turbine Turbine
Estuary
Tide rising (section) Tide falling (section)
Case: The River Rance Tidal Power SchemeCase: The River Rance Tidal Power SchemeHow tidal power is harnessed How tidal power is harnessed
to generate electricityto generate electricity As the tide rises water from the sea flows through this dam which drives the turbines to produce electricity.
When the tide ebbs, the trapped water is released and flows through the dam back to the sea.
Unit 5 The ocean resources
Sea water is trapped behind the dam to form a reservoir.
Case: The River Rance Tidal Power SchemeCase: The River Rance Tidal Power SchemeUnit 5 The ocean resources
Capacity Capacity of power of power plant:plant:
240 000 kw
Year Year Built :Built :
1967
Advantages :Advantages : It does not pollute the environment. It is clean and inexhaustible.
Can we obtain energy from our oceans?Can we obtain energy from our oceans?Marine disputes
As oceans are rich in food and mineral resources, disputes over fishing rights, mining rights, continental shelf boundaries, islands and reefs regularly occur among coastal countries.
For example: Diao-Yu-Tai, which belongs to China is claimed by Japan.
Unit 5 The ocean resources
Terms to learnTerms to learnPhytoplanktonPhytoplankton (浮游植物浮游植物 ) -- very tiny
plants that drift or float in the ocean.
ZooplanktonZooplankton (浮游動物浮游動物 ) -- very tiny animals that drift or float in the ocean.
Coal seamCoal seam (煤層煤層 ) -- layers of coal.
Fossil fuelsFossil fuels (化石燃料化石燃料 ) -- these are the remains of organic materials in rocks and are made up of hydrocarbon compounds. Oil and coal are examples of fossil fuels.
Unit 5 The ocean resources