'To see a world in a grain of sand', the opening sentence of the poem by William Blake, is an oft-used phrase that also captures some of what geologists do.
that track the composition of their parental magma, like how a surname might track a person's family.
Our results from this approach suggest an approximate 200-million-year rhythm to crust production on the early Earth.But there is another process with a similar rhythm. Our Solar System and the four spiral arms of the Milky Way are both spinning around the supermassiveThe spiral arms orbit at 210 kilometers per second, while the Sun is speeding along at 240km per second, meaning our Solar System is surfing into and out of the galaxy's arms.
Geological events, including major crust formation events highlighted on the transit of the Solar System through the galactic spiral arms. NASA/JPL-Caltech/ESO/R. Hurt) So, there seems to be a possible connection between the timing of crust production on Earth and the length of time it takes to orbit the galactic spiral arms – but why?As the Solar System periodically moves into a spiral arm, interaction between it and the Oort cloud is proposed to dislodge material from the cloud, sending it closer to the inner Solar System. Some of this material may even strike Earth.belt, which on average arrive at speeds of 15km per second.
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