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A comment on Attempt to plug a wasp nest sparked the biggest wildfire in California history. Parent comment

Re:Attempt to plug a wasp nest sparked the biggest wildfire ... by semi-extrinsic on Friday June 07, 2019 @04:54PM (#20128524)
You can definitely make sparks from metal-on-rock contact, FWIW. Concrete contains gravel for filler material etc.
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Re:Attempt to plug a wasp nest sparked the biggest wildfire ... by twothamendment on Saturday June 08, 2019 @12:27AM (#20130637)
For sure. I see it when I work in my yard late into the summer. As it gets dark I've made sparks with shovels, picks and quite often the teeth on the excavator bucket will scrape a rock and make some pretty good sparks.
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