Like the cauliflower, when it was once happily living in a field of cauli cousins, stromatolites get energy from the Sun. This is because these rocks are made by bugs - actually, a special type of bug, called cyanobacteria (that means blue-green bacteria). Yes, bacteria - those invisible creatures that make a nuisance of themselves by getting up your nose and giving you a cold, or worse.
Some are a bit more choosy about where they live and hang out in the sea or in lakes and have this clever way of making rocks. (And aren't you glad this type don't live up your nose?)
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