MCQOPTIONS
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				| 1. | 
                                    When water freeze in the polar seas the salts | 
                            
| A. | from a layer on top | 
| B. | remain in the substance water that does not freeze | 
| C. | sink to the bottom | 
| D. | partly freeze and partly sink to the bottom | 
| Answer» C. sink to the bottom | |