Particles & Waves

By EdwardFenner

Boulder dash

This boulder sits on the corner of a commercial unit in an industrial park for light industry. I have to walk past it to get to the GO train. I usually just dash around it but it caught my eye today because the light on it was nice - evening light tends to accentuate red hues and in this granite there are a lot of pinkish tones. A typical Canadian rock for the area - just south of the Canadian Shield. It was probably dropped here during the last Ice Age when Toronto was covered by a glacier several kilometres thick. It would be at least 570 million years old. Boulders are forever being dug up when holes are being dug. Most get dumped into Lake Ontario or elsewhere as clean fill. Some, like this one, end up as lawn ornaments. Now, if this rock had landed here as a meteorite, the crater would be around 90 metres across according to data I input at this crater calculator website from the University of Arizona's Department of Planetary Sciences.

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