Adam Frank: belief

Transcript context

…Clip it. It still is. What I mean by that is that there really weren’t many mountain ranges. The beginning of, I think the term is orogenesis, mountain building, the true Himalayan-style giant mountains, didn’t happen until this more robust form of plate tectonics, where the plates are really being driven around the planet. That is when you get the crusts hitting each other, and they start pushing into these Himalayan- style mountains. The weathering of that, the erosion of that puts huge amounts of nutrients, things that microbes want to use, into the oceans. And then what we call the net primary productivity, the bottom of the food chain, how much sugars they are producing, how much photosynthesis they are doing shot up by a factor of almost 1000. The fact that you had plate tectonics supercharged evolution in some sense. We’re not exactly sure how it happened, but it’s clear that the amount of life, the amount of living activity that was happening really got a boost from the fact that something there was this new vigorous form of plate tectonics. It’s nice to have turmoil. In terms of temperature, in terms of surface geometries, in terms of the chemistry of the planet, turmoil.…

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