1. Use the idea of up thrust to explain why icebergs float. 2. Describe one way in which the density changes when water freezes is different to the change when other Liquids freeze

The answer is 12, for the points

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

Iwould think it is temperature, silica, oxides (gases)