Wow, 7cm/yr seems fast. I thought I read once it was 1-2 cm/yr, about the same as your fingernails grow (it was a rule of thumb). Probably different plates are

Wow, 7cm/yr seems fast. I thought I read once it was 1-2 cm/yr, about the same as your fingernails grow (it was a rule of thumb). Probably different plates are moving at different speeds. I think it's exciting to see examples of continental drift on the human scale. Usually, all the models talk about Pangea and hundreds of millions of years, and our brains have trouble seeing the context. But I wonder if we don't need a more flexible system, maybe like leap days and leap seconds that get added much more often. Or just have a global reference and an offset for the local datum that can be updated yearly.