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PHYSICAL AND CHEMICAL CHARACTERISTICS OF THE ADRIATIC SEA On Wednesday afternoon we were divided into two groups. One group went to Morkan while the other stayed at the beach. We had to identify factors which influence on the cleanliness of the sea and biocenosis of the Adriatic Sea. For that we needed a boat. We found one on the beach. We pushed it into the sea and climbed into it. The boat didn’t have a motor so we had to row. After 5 minutes of rowing we were far enough from the beach and we started with our work. First we needed to do exact measurements of the sea temperature at two different depths. First we put the thermometer at the surface, then in the sea at 1 m depth beneath the surface and then 2 m depth beneath the surface. We figured out that the temperature on the surface is 21°C, at 1 m deep it’s 20°C and at 2 m deep its 15.5°C. After that we needed to determine the visibility of the sea. We put the sacci's disc hanged onto a rope. We let it go down slowly until we couldn’t see it and then we measured the depth in metres. The wind was very strong so this procedure was hard to do but in the end we managed. The visibility was 18 metres. Our last task was to take two samples of the sea. We needed those samples for the determination of oxygen, contents of nitrate and sulphate. After that we had to get back. The wind was so strong which made it difficult to row. Fortunately everything turned out good in the end. Our job was to investigate physical and chemical characteristics that influence on biocenosis of the Adriatic Sea. First we determined two spots (Spot A and Spot B) where we did our investigations. Spot B is deeper and it’s in open sea, also more currents occur there. Temperature of the air and sea was usual for this time of the year, which is good for sea life. We measure PH- value of sea water with the universal indicator paper, and we get its neutral PH- value (PH-7). That’s good for the biocenosis because the animals and plants develop best in these habitats. On the quantity of PH-value influenced waste water from hotels, ships, factories etc... After that we measured the visibility and it’s about 18 metres, which means that the sea is very clean. The quantity of oxygen is an important factor determining cleanliness of the sea. Our results were pretty high, which is good for sea life. Then we investigated the rate of pollution on the land and the quality of drinking water. We concluded that the water is very hard and there is lots of Chlorine in it but it’s in accordance with official measures of the quality of water. The pollution of the land isn’t that bad but it could be better. We found lots of cigarette butts, plastic bottles and pieces of broken glass which proves that people don’t care about nature or the environment. Last of all we evaluated the aesthetics of the beach. We concluded that the natural conditions are pretty good, but people are the reason why our beaches look so pathetic, so first we have to change ourselves and then the results will be better.
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