Seaspiracy.

What is shark-finning:    Shark finning at sea enables fishing vessels to increase profitability and increase the number of sharks harvested, as they must only store and transport the fins, by far the most profitable part of the shark: the shark meat is bulky to transport.

Why is it a delicacy:    The cartilage in the fins is usually shredded and used primarily to provide texture and thickening to shark fin soup, a traditional Chinese soup or broth dating back to the Song Dynasty (960-1279). The dish is considered a luxury item embodying notions of hospitality, status, and good fortune

Rusty Nails

 Aim: To investigate the factors that cause rusting in iron.

Equipment: Four test tubes, test tube rack, a bung, four iron nails, boiled water, tap water, saltwater, cooking oil, calcium chloride. 

Method: 1. Label four test tubes A - D and place them in a test tube rack.

               2. Test tube contents: A= Iron nail and tap water.

                                                  B = Iron nail and salty water.

                                                  C = Iron nail, boiled water, oil.

                                                  D = Iron nail and calcium chloride. Sealed with a bung.

Conclusion: Oxygen and water make metal rust quicker, If you seal of the oxygen it will rust slower.