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s density, the water in the ocean is always moving. More questions of each paragraph Para. 2: What is the chemical structure of water ? ◆ What are different parts of the chemical structure of water ? What does the chemical structure of water work ? Two hydrogen atoms and one oxygen atom . Positive end , negative end . It causes water to be able to dissolve both solids and gases . ◆ ◆ Para. 3: What is salinity ? What are different parts of salinity ? How does salinity work ? What are some examples of salinity ? Dissolved gases and solids mixed with pure water Dissolved gases and solids , pure water . It affects water’s weight and freezing point . Ocean water . ◆ ◆ ◆ ◆ Para. 4 What is density ? What are different parts of density ? How does density work ? What are some examples of density ? Density is the relationship between mass and volume . Mass and volume . A less dense substance floats on a more dense substance . Water (1,000 kg/m3 ) 。What’s thi