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The most visible source of seafood is ocean

Seafood  is all things such as plant and animals that we can eat them and   thy are living in ocean or sea.

SOME EXAMPEL FOR SEAFOOD IS:

fish (such as  herring fish)

mollusks (such as clams)

crustaceans (such as shrimp)

marine reptiles (such as crocodiles and turtles)

marine mammals (such as whales).

in 2012, nearly 160 million tons of fish caught or produced!

About 85% of fish is for human consumption.

If you like to have healthy body seafood it’s a good choice becouse seafood   have got lots of good thing  such as fiber and vitamin

eating fish  for long time can help   your heart
and eating shrimp its good for your skin

Production  seafood is effective  for economy too  for example it’s a interesting way for  tourist attraction  and fishing is a popular work in small city.

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Group 2 - Building materials and chemicals

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Group 2 - Building materials and chemicals

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Sea salt and limestone are extracted on land today.

Salt is harvested through solar evaporation from seawater. Wind and the sun evaporate the water from shallow pools, leaving the salt behind.

Limestone is extracted from the rock either by blasting or mechanical excavation depending on the hardness of the rock.

Seawater contain minerals that are dissolved solids such as sodium chloride and magnesium.

Other materials such as manganese, phosphorites and zinc are hard to be exploited due to the landscape its found it.

Sand and gravel are extracted offshore to provide aggregates for building materials and roads.

Sand is extracted oftenly by digging up with shovels or bare hands.

Gravel is extracted with front-end loaders, and bulldozers are all used to pull the gravel.

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A Power Generation are small, self-contained power plants built around a reciprocating engine and an alternator.

And there are 4 kinds thermal power generation, Nuclear power generation, Hydro-electric power generation, solar power

There are significant environmental and economic challenges in scaling up the technology and getting the electricity from the source to the areas where its demanded.These are the main methods for harnessing the power of the oceans:

Offshore wind and farms

Offshore wave generators

Nearshore/onshore wave generators

Tidal stream generators

Tidal barrages

Most power generating equipment produce electricity by spinning a mechanism in an alternator. How the mechanism is made to spin depends on what technology is being used.

Top 4 countries that produce power per year

- China (6,310 billion kWh per year)
- United States (3,911 billion kWh per year)
- India (1,408 billion kWh per year)
- Russia (1,065 billion kWh per year)

There are significant environmental and economic challenges in scaling up the technology and getting the electricity from the source to the areas where its demanded.These are the main methods for harnessing the power of the oceans:

Offshore wind and farms
Offshore wave generators
Nearshore/onshore wave generators
Tidal stream generators
Tidal barrages

Most power generating equipment produce electricity by spinning a mechanism in an alternator. How the mechanism is made to spin depends on what technology is being used.
How is electricity generated?

An alternator is an electrical generator that converts mechanical energy to electrical energy in the form of alternating current
An alternator functions similarly to an electric motor.

Electric motors spin a rotor using electricity.

Alternators work in the opposite way: instead of utilizing energy to generate motion, they use motion to generate electricity.

Many motors, in fact, can be used as improvised alternators

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Tourism is one of the worlds largest and fastest growing economic sectors its one of the world’s top job creators (1 in every 12 jobs), it generates US$ 3 billion/day in overall export income. Its the main export for 1/3 of developing countries and it accounts for over 25% of GDP in many SID .
Advantages of tourism:

Growth and boost in Economic activities.

Boost wide scale industry revenues.

Infrastructure development.

Country's improved brand image.

Disadvantages of tourism:

Intense use of resources.

Physical damage to natural and marine areas.

Increased waste, pollution and emissions.

Land use and infrastructure development.

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The main transport mode for global trade is ocean shipping: around 90% of traded goods are carried over the waves. As such, the oceans provide the main transport arteries for global trade. This comes with opportunities and challenges.
As demand for global freight increases, maritime trade volumes are set to triple to 2050.
Maritime transport forms part of a whole cluster of economic activities that can create economic value added.

The oceans play a vital role in the world economy. Transport of goods in increasingly large, fast and specialised ships is a key feature of 21st-century trade, with an estimated 9.93 billion tonnes of freight transported in 2013. The majority of this trade is in container ships, bulk carriers and tankers. Further to these, naval vessels, cruise ships and ferries are common. This volume of shipping is not without environmental concerns due to pollution, accidents and impacts on marine species.

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Oceans and seas contain 97% of the water on earth but the salinity level is an average of 3.5% meaning the water is not safe for human needs.

The extraction of fresh water is either through reverse osmosis or distillation, distillation is very expensive compared to land based fresh water resources.

Around 1% of all fresh water is extracted from saltwater, over a 100 countries use desalination but mostly middle eastern countries having the highest capacity plants to date.

Freshwater scarcity is currently increasing due to the there would be a high investment in desalination in the future. This would make technology more affordable and reduce the large impact of the environment from waste going into the sea.