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Understanding chemical and physical changes is a strange part of science. Once you learn to use chemical equations, it is so simple that no one even thinks about it. Before you learn to use chemical equations, it is so complex that most people don't really understand it. For a better view of that, you might also read Changing How We Look at Changing.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!'
(I found it!) but 'That's funny ...' - Isaac Asimov
What if you live in a big city, with no road cuts or rock outcrops nearby? Are you out of luck for finding rocks to study? No! Many of the buildings in most cities have decorative stonework covering their outer walls and their lobbies. You won't be able to collect specimens, but you can collect some marvelous photographs.
Notice that the definition of a rock does not say that it has to be inorganic. Some sedimentary rocks are organic, made up of materials that were once part of a living organism. Since minerals cannot be organic, organic rocks may not contain any minerals.
This is not an article about the pros and cons of genetically modified organisms. I am not arguing for them or against them. Instead, the goal of this article is to help you learn some of the basic science involved, to make it easier for you to fact check articles on this topic.
