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18 | Seawater MEDCLIC 2.3 DENSITY Density is the quantity of mass an object contains. The density of seawater depends on the quantity of mass of salts it contains, so it is related to salinity. At higher salinities seawater becomes denser. Temperature also affects density, at higher temperatures density decreases. Therefore, the density of seawater varies according to temperature and salinity. In the sea, the differences in salinity and temperature cause the water to distribute itself into layers and gives rise to density currents. It is possible to identify 3 main layers: 1 2 3 On the surface An area where water masses of different densities converge, called a thermocline * In the deep water zone There is a layer of warmer, less dense water. The waters of different densities don’t mix and they form a buffer zone, a barrier we call a thermocline, and in this layer the temperature declines sharply. The water is colder and denser. Fig. 2.2 Wind direction 1 2 3
MEDCLIC / STUDENT Seawater | 19 A.2.8. THE SAME SEA, DIFFERENT DENSITIES Choose the correct option to complete the following sentences: 1 - The surface layer of the sea is ... a b c Colder and more dense. Warmer and more dense. Warmer and less dense. 2 - The thermocline ... a b c Has the same temperature as the surface but is more dense. The temperature declines sharply and it is slightly denser than the surface layer of water. Is colder and less dense than the water in the deep water zone. 3 - The deep layer ... a b c Is the most dense and therefore the saltiest. Is the least dense and the saltiest. It is the coldest and least dense.
Page 1: MEDCLIC / STUDENT’S BOOK 2 SEAWAT
Page 4 and 5: 2 | Seawater MEDCLIC 2.1 SEAWATER:
Page 6 and 7: 4 | Seawater MEDCLIC 2.2 PHYSICAL A
Page 8 and 9: 6 | Seawater MEDCLIC Did A.2.1. you
Page 10 and 11: 8 | Seawater MEDCLIC A.2.3. THE JOU
Page 12 and 13: 10 | Seawater MEDCLIC A.2.4. THE SA
Page 14 and 15: 12 | Seawater MEDCLIC Ocean researc
Page 16 and 17: 14 | Seawater MEDCLIC A.2.5. WORD S
Page 18 and 19: 16 | Seawater MEDCLIC A.2.1. EL MED
Page 22 and 23: 20 | Seawater MEDCLIC 2.4 ACIDITY L
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Page 26 and 27: 24 | Seawater MEDCLIC A.2.10. GIVE
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