Reflect on the expansion of water and salt water experiments you and your classmates performed. What are some of the interesting results and struggles with this experiment.
It was interesting to be able to show that water expands even if you don't have the fanciest tools to measure. Sometimes your eyes are wrong and you have to rely on an experiment to explain something, but with a lot of things you can see the change. It was also cool to see that everyone kind of had the same thing, showing that this is not too hard of an experiment, and that experiments in general are not too hard if you make sure to set up good procedures and then follow them.
Is the earth warming?
Yes. Or it's at least becoming more dynamic, whether it be colder or hotter or whatever global warming is supposed to bring. More hurricanes if I had to guess. Global warming though is the warming of the near surface air and oceans.
Why is there a controversy around that?
You can't just go out and measure the ozone layer and show people how big it is. You have to measure CO2 levels and other levels of certain molecules, and depending on where and when you do them you could get very different results. This is because the earth is always moving things around and so the level could be on thing one day and something else the next, but that old amount will now be somewhere new and this new amount came from somewhere else. Also, just showing that the oceans are getting warmer is a correlational study and doesn't show causal relationships. This is very important because it allows people to easily say things like it's just the earth's natural cycle, and you can't say 'no we've caused it' because you've only shown that it's getting higher and not why it's getting higher. Now that they do show why it is getting higher though, such as cars, there are too many other factors for people to have to stop being ignorant and realizing that they are part of the problem.
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