If you take a look at any world map, what can you identify at an instant?
You might identify that there is more blue than green. It is a fact that this blue represents water. In other words, you could call this water salty or the blue sea.
The blue sea is a body of salty water that nearly covers about 70 per cent of the earth’s surface. It is the source that moderates the earth’s climate and is a part of critical natural cycles such as the water cycle, carbon cycle and nitrogen cycle etc.
Even though the scientific study about the blue sea began since the explorations, it has a greater study value even before that. The blue sea is also the primary natural environment for the occurrence of the evolution of the organisms. The organisms that evolved and adapted to live in the land had initially lived in the sea previously. Some scientific information proves the above certain fact.
When you take a sample of the sea the most abundant solid dissolved in seawater is sodium chloride. There are also solids such as magnesium, calcium, potassium etc. dissolved in seawater. But the concentrations of these solids can vary. Sea water is usually inconsumable. This is due to salinity. The percentage of salinity present is varying with depth. Therefore salinity near the lower surface is lower relative to higher depths.
When you are at the beach, you might notice that endless waves come towards the land. These waves are formed because of the wind that blows over the surface. These sea waves break when they enter shallow water. These winds have small amounts of salts dissolved in the air as a high concentration of salt is present in the blue sea.
The rise and fall of the sea level are generally termed as tides. It is surprising that the rotation of the earth and gravitational effects of orbiting moon effect for the formation of waves.
Difference between the blue sea and the ocean
Majority of the people doesn’t know clearly about the difference between the blue sea and the sea. Usually, seas are smaller than beaches. They are partly landlocked sections of the ocean and are found on the margins of oceans. While oceans are more abundant and are entirely landlocked.
Colours of the sea with the depth
Usually, the shallow sea is the most favoured and loved area among all people. This shallow water has a light blue shade together with the white waves in between. The number of sea organisms in the shallow areas is comparatively low. But small plants together with mosses on rocks add beauty to the beach.
When moving a little further from the shallow area to the centre of the sea the water turns deep blue. The coral reef is a significant part of this area that adds beauty to the blue sea. Different organisms live in these coral reefs. Picturesque fish is commonly seen among these beautiful corals.
The deep sea mostly takes a deep green, blue mixed colour. Here larger sea organisms that include sharks, whales are found. This is the area that supports the fishery industry. There are also billions of unknown plants hidden that are not seen. There are so many uncovered hidden secrets at the bottom of the sea. These secrets add different meanings to the blue sea.
As discussed above, though different colours are depicted to varying depths of the sea, the standard colour blue makes the blue sea.
Roles of the sea
As the endless sea, the functions and features in the sea are similarly countless. There are no words to express the enormous importance of the sea. It is a natural resource for billions of organisms. Their lives are depending on this salty blue sea. The below-given details show some roles of the sea.
The sea is one of the most attractive natural environment that most people like to visit. The main reason for its attractiveness is its beauty and calmness. The blue sea is just like a reflective image of the blue sky. It is just like the real sky created on earth. People visit the blue sea to see the view of the sea and air that is separated by the horizon.
The endless gushing of waves that are created by the wind is the first view when you go to the beach. The calm waves that flow towards the shore create a noisy sound when reaching the land. This happens due to the breaking of waves. This sound is unique to the blue sea and could be called as the sound of the sea.
The coral reefs are a particular part of the beauty. The corals are unique flowers that you cannot find in any other environment. These colourful corals are the stars of the blue sea that could be seen through crystal clear blue water. Colourful fish that swims among these coral reefs creates a picturesque view.
However, the best picturesque view of the sea is the sink of the red ball fire or the sunset.
When explorations began to search for other parts of land transportation were taken through sea routes. In the period 1768 and 1779 captain James Cook became the first explorer to explore the Pacific Ocean. Since then the world map became completed due to such other explorations. These explorations also proved that fact that earth was a sphere. Until the discovery of aeroplane transportation through the sea was the primary method to reach to other countries.
Even today transportation of heavy loads, oil and other essential stuff is done through sea routes. As sea transport is so crucial a harbour is a vital source of a country.
The fishing industry is the most major industry of the blue sea. The number of people depending on this industry is uncountable. As a high percentage of the people living around this area depends on this particular industry. The fish requirement at the interior of the country is entirely fulfilled. This industry is a significant source of the economy of the country due to exportation.
Tourism is the other major industry. If a country is reaching with a beautiful beach and sea area it attracts tourists. This also creates job opportunities for the people living around this area. Hence the economy of this area strengthens. The coral reefs become an economic resource in tourism.
Production of salt is a significant use other than the fishery. Salt is an essential, most required ingredient that is a part of the kitchen. Salt is also a necessary ingredient for the economy of the country.
Production of cement is also another related output of the sea. The sea water is a good source of calcium that could be used to produce cement. Even though glue is used in the construction field, it also adds value to the economy of the country. Apart from the production of cement, manufacture of quick lime and slaked lime are other outputs of the compound calcium.
Production of electricity by sea breeze is also a meaningful use. In some countries, sea waves are used to produce electricity. Production of electricity directly involves the economy of the country.
Literary aspect of the blue sea
The sea is a unique natural environment that attracted many poets and writers. You could find many literary creations related to the blue sea. Most poets and writers try to depict human emotions by taking the sea as a complementary item. When considering the sea, there is a wide range of creativity. This has led to the output of many creations.
The king of the blue sea
‘The whale’ is the largest mammal living on this planet. So there is no doubt about calling the whale as the king of the blue sea. The whales are widely distributed massive aquatic marine mammals. These organisms including dolphins and porpoises belong to the order Certartiodactyla.
Did you know?
The closest living relatives of the whales are the hippopotamuses. The whales had initially diverged from hippopotamuses about 40 million years ago.
These creatures are unable to survive on land. Their lives are adapted to breathe underwater. The size of the whales varies from a range of 2.6 meters (8.5ft) with a weight of 135 kilograms (298lb) dwarf sperm whale to the 29.9 meters (98ft) with a load of 190 metric tons (210 short tons) blue whale. The blue whale is the largest creature that has ever lived among other animals.
As whales have evolved from land-living mammals, they breathe air regularly although they remain underwater for long periods. They have modified nostrils named blowholes located on top of their heads for this purpose. These creatures have a layer of fat under their skin and are warm-blooded. Whales typically have streamlined, fusiform bodies together with two limbs that are modified into flippers. But they are not flexible creatures as seals. Whales usually prefer the cold waters of the northern and southern hemispheres but migrate towards the equator to give birth. Some species of whales can travel thousands of miles without feeding. The male whales typically mate with several females every year while female whales only mate every two to three years. The young whales are called ‘calves’ and are usually born in the spring and summer months. The female whales take the total responsibility for raising their young. Some mother whales fast and nurse their young calves for one to two years. These creatures produce great vocalisations for communicative purposes.
Special features of whales
Whales have specific adaptations that are specified for living in the marine environment. The sound is not passed similarly from the outer ear to the middle ear as humans. But is received through the throat from which it then passes through a low-impedance fat-filled cavity to the inner ear. The listener is located isolating from the skull and contain air-filled sinus pockets. This feature allows for a greater directional hearing.
The whale eye is relatively smaller in size when compared to its size, yet they retain a reasonable degree of eyesight. The eyes of whales are placed on either side of the head, so their vision consists of two fields. They have a limited capacity for colour vision than most mammals due to lack of short wavelength sensitive visual pigments in their cone cells.
Whales are thought to lack a good sense of taste as their taste buds are atrophied.
When considering the sense of smell, some whales have no knowledge of smell as olfactory lobes are absent.
Whale communication differs from other communicative methods as they use melodic sounds. These melodic sounds are also known as ‘whale song’. Some whales use the technique of sonar to communicate with whales that are miles far away. It has also been found that captive whales occasionally mimic human speech.
Whales are known to be intelligent species that are known to teach, learn, cooperate, scheme and grieve.
Whales are known to be conscious breathers that are similar to land dwellers. It is a fact that all mammals sleep but these mammals are unable to remain unconscious for long as they drown. It was recorded that some whales in captivity had slept with one side of their brain at a time. So at this time they may swim, breathe, avoid predators and avoid social contact during their rest. It was also found that sperm whales sleep in vertical postures just under the surface in passive shallow generally during the day.
As whales are exciting sea creatures, whale watching has become a form of tourism around the world. Millions of people visit all seas around the world to catch a glimpse of these beautiful creatures throughout the whole year. It is entertaining to watch these creatures play with blue water.
Many countries charge a considerable amount for whale watching, but people tend to spend any amount to get this experience at least once in a lifetime.