Oceans as a resource Revision Notes

Oceans are a major source of food globally, providing fish, shellfish, and other seafood that contribute significantly to human nutrition. Marine fisheries support millions of people through direct consumption and employment in fishing industries. For example, small-scale coastal communities often rely heavily on fish as a primary protein source. Sustainable fishing practices are essential to prevent overfishing and maintain fish populations for future generations.

• Fish and shellfish are primary ocean food resources.
• Marine fisheries support global nutrition and livelihoods.
• Sustainable management is necessary to avoid depletion.

The ocean contains numerous chemical compounds that are extracted for use in pharmaceuticals, cosmetics, and industrial products. For instance, certain marine organisms produce bioactive substances used in medicines to treat diseases. Additionally, minerals dissolved in seawater, such as magnesium and bromine, are harvested for various applications. These chemicals are valuable due to their unique properties and biological origins.

• Marine organisms produce chemicals used in medicines.
• Minerals like magnesium are extracted from seawater.
• Ocean-derived chemicals have industrial and pharmaceutical uses.

Sand, gravel, and other aggregates are mined from the seabed to supply construction industries. These materials are essential for building infrastructure such as roads, buildings, and concrete structures. For example, coastal dredging operations collect sand for beach nourishment and construction projects. However, extraction must be managed carefully to avoid damaging marine habitats and causing coastal erosion.

• Sand and gravel are extracted from the ocean floor.
• These materials support construction and infrastructure development.
• Environmental impacts require careful regulation of extraction.

Oceans offer renewable energy through wave and tidal power, harnessing the natural movement of water to generate electricity. Wave energy converters capture the energy of surface waves, while tidal turbines exploit predictable tidal currents. For example, tidal barrages installed in estuaries can produce consistent power. These energy sources are clean and sustainable alternatives to fossil fuels but require suitable coastal locations and investment in technology.

• Wave and tidal energy are renewable ocean energy sources.
• Wave energy converters and tidal turbines generate electricity.
• These methods reduce reliance on fossil fuels and lower emissions.

Coastal and marine environments attract tourists for activities such as beach visits, diving, and boating. Tourism linked to oceans supports local economies by creating jobs and generating income. For example, coral reefs draw snorkelers and divers worldwide. However, tourism must be managed sustainably to protect fragile ecosystems from damage caused by overuse or pollution.

• Oceans provide recreational and tourism opportunities.
• Tourism supports local economies and employment.
• Sustainable tourism protects marine environments.

Oceans serve as major transportation routes for international shipping, facilitating global trade by allowing large volumes of goods to be moved efficiently. For instance, container ships travel across oceans connecting continents. Additionally, seawater can be treated through desalination processes to produce safe drinking water, which is crucial in arid regions or where freshwater is scarce. Desalination plants remove salt and impurities, providing an alternative water source, though the process can be energy-intensive and costly.

• Oceans are vital for global shipping and trade routes.
• Desalination converts seawater into safe drinking water.
• Desalination helps address freshwater shortages but requires energy.