EL 1 - Where do the chemical elements come from?, EL 2 - How do we know so much about outer space?, EL 3 - Electrons, where would we be without them?...
2.a. Biological resources within oceans can be used in sustainable or unsustainable ways, 2.b. The use of ocean energy and mineral resources is a contested issue, 3.c. The pattern of global ocean currents can disperse and concentrate pollution...