- Give me an example of how to select an issue/problem/topic from one of the physical sciences: physics, chemistry, earth science, or astronomy and then of how to propose a hypothesis related to the issue.
I will make a choice that is both chemistry and earth science and is also an extremely timely topic on the world stage: climate change. The emission of greenhouse gasses like carbon dioxide help to trap in radiant heat from the sun and keep it in earth's atmosphere rather than dissipate out into space. While this is neccesary to maintain life on earth, too high levels of greenhouse gases will trap too much heat and raise the temperature of the earth's surface above the average normal. While there can be little doubt that the earth's temperature is generally increasing in recent years, the biggest controversy is whether this increase is due to natural factors or man-made factors. So an initial hypothesis could be: "climate change in recent years is due to human factors, namely a man-made increase in greenhouse gases." The next step would be to either prove or disprove the hypothesis by looking at various greenhouse gas levels over a large number of years and also the sources of these gases (human versus nature).