課程目標 Lesson objective: 

1. 回顧海洋汙染

2. 藉由鹽水認識浮力，解釋為何油汙會浮於海面

3. 模擬海洋汙染，藉由清理油汙和汙染物來了解清理海洋汙染之不易和嚴重性

課程任務 Lesson Assignment:

1.  1st period: Students will use two cups of water to show how density liquids react with each other. Explain how cleaning the oceans of trash is different to cleaning the ocean of oil. Clean the oil slick they have created