Answer: You might be able to guess this one. I searched it up online, and I learned that my assumptions were correct, even though it's gross.
Those black spots on the pavement while you're walking around are old, chewed pieces of gum that people threw down onto the pavement some time ago.
I can't be sure how old each of those pieces of gum are, although I'm guessing that they're somewhere between two months and a year old. Gross, right? That's the product of people throwing their gum on the ground. Over time, dirt and grime collect on it and it gains that blackish color that we love so much.
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