The ocean wildlife …. What is there in that vast ocean? By Rachel Kent and Cameron Gonet Life in the Oceans Objectives Ocean Chemistry and Marine Life Sunlight and Marine Life Ocean Environments Life in the Oceans
What is there in that vast ocean?
Rachel Kent and Cameron Gonet
~Describe three important resources of the ocean.
~Explain the threat to ocean life posed by water pollution
~Throughout the world the need for fresh water is increasing rapidly.
~The increasing demand for water can be met in two ways. First, the fresh water now available can be conserved to avoid waste. Second, the amount of available fresh water can be increased. The water supply can be increased by finding ways to convert ocean water to fresh water.
~Distillation is one means of getting fresh water from the ocean, which involves boiling the water. Heat causes the liquid water to evaporate, leaving dissolved salts behind. However, evaporating liquid involves a great deal of heat and consistency of heat.
~Another method of desalinating ocean water involves freezing the water. When water freezes, the first ice crystals that form are free of salt. The salt remains in pockets of liquid water in the ice. The ice can be removed and melted to obtain fresh water.
~Of all the resources that the ocean is capable of supplying, the one in greatest demand is protein-rich food. At this time a large part of the population of the world has a starchy diet. Such a diet can maintain life, but the lack of protein to build strong tissues decreases the ability of a person’s body to fight disease. Perhaps half a billion people in the world suffer from some form of disease caused by a lack of protein in their diet.
~In the future aquaculture, the farming of the ocean, will become an important part source of food production. Aquaculture involves developing and raising special breeds of marine animals and plants that yield large amounts of food. Aquaculture has already been used to successfully grow catfish, salmon, oysters, and shrimp on large aquatic farms.
~The oceans have been used as a dumping ground for many kinds of wastes, including garbage, sewage, and nuclear wastes. Until recently, most wastes were diluted, or destroyed as they spread throughout the ocean. But the growth of the world population and the increased use of more toxic substances have changed the situation. The ability of the ocean to absorb waists and renew its self cannot match the increasing amount of waste that is being produced worldwide.
~Productive coastal waters are in the greatest danger. Pollution has destroyed clam and oyster beds in some local areas. Sea birds have been found tangled in plastic products. Beaches have been closed because of sewage, medical wastes, and oil washed onto the sand.